100981242 has 20 divisors (see below), whose sum is σ = 226273146. Its totient is φ = 33660360.

The previous prime is 100981189. The next prime is 100981249. The reversal of 100981242 is 242189001.

It can be written as a sum of positive squares in only one way, i.e., 71723961 + 29257281 = 8469^2 + 5409^2 .

It is a super-2 number, since 2×100981242² = 20394422471725128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (100981249) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 311509 + ... + 311832.

Almost surely, 2^100981242 is an apocalyptic number.

100981242 is an abundant number, since it is smaller than the sum of its proper divisors (125291904).

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

100981242 is an equidigital number, since it uses as much as digits as its factorization.

100981242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623355 (or 623346 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 100981242 is about 10048.9423324049. The cubic root of 100981242 is about 465.6721185715.

The spelling of 100981242 in words is "one hundred million, nine hundred eighty-one thousand, two hundred forty-two".