51391610 has 8 divisors (see below), whose sum is σ = 92504916. Its totient is φ = 20556640.

The previous prime is 51391601. The next prime is 51391619. The reversal of 51391610 is 1619315.

It is an interprime number because it is at equal distance from previous prime (51391601) and next prime (51391619).

It can be written as a sum of positive squares in 2 ways, for example, as 50737129 + 654481 = 7123^2 + 809^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 51391610.

It is not an unprimeable number, because it can be changed into a prime (51391619) 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 3 ways as a sum of consecutive naturals, for example, 2569571 + ... + 2569590.

Almost surely, 2^51391610 is an apocalyptic number.

51391610 is a deficient number, since it is larger than the sum of its proper divisors (41113306).

51391610 is a wasteful number, since it uses less digits than its factorization.

51391610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139168.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 51391610 is about 7168.7941803347. The cubic root of 51391610 is about 371.7897461041.

The spelling of 51391610 in words is "fifty-one million, three hundred ninety-one thousand, six hundred ten".