51023618 has 4 divisors (see below), whose sum is σ = 76535430. Its totient is φ = 25511808.

The previous prime is 51023597. The next prime is 51023657. The reversal of 51023618 is 81632015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81632015 = 5 ⋅16326403.

It can be written as a sum of positive squares in only one way, i.e., 49182169 + 1841449 = 7013^2 + 1357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755903 + ... + 12755906.

Almost surely, 2^51023618 is an apocalyptic number.

51023618 is a deficient number, since it is larger than the sum of its proper divisors (25511812).

51023618 is a wasteful number, since it uses less digits than its factorization.

51023618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25511811.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51023618 is about 7143.0818278947. The cubic root of 51023618 is about 370.9002136439.

The spelling of 51023618 in words is "fifty-one million, twenty-three thousand, six hundred eighteen".