51161552 has 40 divisors (see below), whose sum is σ = 107326464. Its totient is φ = 23485824.

The previous prime is 51161543. The next prime is 51161557. The reversal of 51161552 is 25516115.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161557) 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 7 ways as a sum of consecutive naturals, for example, 45833 + ... + 46935.

Almost surely, 2^51161552 is an apocalyptic number.

51161552 is a gapful number since it is divisible by the number (52) 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 51161552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53663232).

51161552 is an abundant number, since it is smaller than the sum of its proper divisors (56164912).

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

51161552 is a wasteful number, since it uses less digits than its factorization.

51161552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 1341 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 51161552 is about 7152.7303877610. The cubic root of 51161552 is about 371.2341355969.

Adding to 51161552 its reverse (25516115), we get a palindrome (76677667).

The spelling of 51161552 in words is "fifty-one million, one hundred sixty-one thousand, five hundred fifty-two".