102991512 has 64 divisors (see below), whose sum is σ = 280476000. Its totient is φ = 31325184.

The previous prime is 102991507. The next prime is 102991519. The reversal of 102991512 is 215199201.

It is a super-2 number, since 2×102991512² = 21214503088092288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102991512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102991519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25914 + ... + 29622.

Almost surely, 2^102991512 is an apocalyptic number.

102991512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102991512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140238000).

102991512 is an abundant number, since it is smaller than the sum of its proper divisors (177484488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102991512 is a wasteful number, since it uses less digits than its factorization.

102991512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820 (or 3816 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 102991512 is about 10148.4733827310. The cubic root of 102991512 is about 468.7419380658.

It can be divided in two parts, 10299 and 1512, that added together give a palindrome (11811).

The spelling of 102991512 in words is "one hundred two million, nine hundred ninety-one thousand, five hundred twelve".