51309952 has 16 divisors (see below), whose sum is σ = 102219300. Its totient is φ = 25654912.

The previous prime is 51309943. The next prime is 51309953. The reversal of 51309952 is 25990315.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×51309952² = 5265422348484608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51309953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200302 + ... + 200557.

Almost surely, 2^51309952 is an apocalyptic number.

It is an amenable number.

51309952 is a deficient number, since it is larger than the sum of its proper divisors (50909348).

51309952 is an equidigital number, since it uses as much as digits as its factorization.

51309952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400873 (or 400861 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 51309952 is about 7163.0965371130. The cubic root of 51309952 is about 371.5927249618.

The spelling of 51309952 in words is "fifty-one million, three hundred nine thousand, nine hundred fifty-two".