51131696 has 100 divisors (see below), whose sum is σ = 127120584. Its totient is φ = 19921440.

The previous prime is 51131693. The next prime is 51131719. The reversal of 51131696 is 69613115.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a super-2 number, since 2×51131696² = 5228900671672832, which contains 22 as substring.

Its product of digits (4860) is a multiple of the sum of its prime divisors (20).

It is not an unprimeable number, because it can be changed into a prime (51131693) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4648331 + ... + 4648341.

Almost surely, 2^51131696 is an apocalyptic number.

51131696 is a gapful number since it is divisible by the number (56) 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 51131696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63560292).

51131696 is an abundant number, since it is smaller than the sum of its proper divisors (75988888).

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

51131696 is an frugal number, since it uses more digits than its factorization.

51131696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 20 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 51131696 is about 7150.6430480062. The cubic root of 51131696 is about 371.1619086830.

The spelling of 51131696 in words is "fifty-one million, one hundred thirty-one thousand, six hundred ninety-six".