51512402 has 8 divisors (see below), whose sum is σ = 77364300. Its totient is φ = 25724304.

The previous prime is 51512389. The next prime is 51512407. The reversal of 51512402 is 20421515.

It can be written as a sum of positive squares in 2 ways, for example, as 51251281 + 261121 = 7159^2 + 511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51512407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13877 + ... + 17192.

Almost surely, 2^51512402 is an apocalyptic number.

51512402 is a deficient number, since it is larger than the sum of its proper divisors (25851898).

51512402 is a wasteful number, since it uses less digits than its factorization.

51512402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31900.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51512402 is about 7177.2140834728. The cubic root of 51512402 is about 372.0808058553.

Adding to 51512402 its reverse (20421515), we get a palindrome (71933917).

The spelling of 51512402 in words is "fifty-one million, five hundred twelve thousand, four hundred two".