51115974 has 64 divisors (see below), whose sum is σ = 133249536. Its totient is φ = 12685824.

The previous prime is 51115973. The next prime is 51115979. The reversal of 51115974 is 47951115.

It is a super-2 number, since 2×51115974² = 5225685595937352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6529 + ... + 12035.

It is an arithmetic number, because the mean of its divisors is an integer number (2082024).

Almost surely, 2^51115974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51115974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66624768).

51115974 is an abundant number, since it is smaller than the sum of its proper divisors (82133562).

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

51115974 is a wasteful number, since it uses less digits than its factorization.

51115974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5549.

The product of its digits is 6300, while the sum is 33.

The square root of 51115974 is about 7149.5436217985. The cubic root of 51115974 is about 371.1238630989.

The spelling of 51115974 in words is "fifty-one million, one hundred fifteen thousand, nine hundred seventy-four".