51236405023 has 4 divisors (see below), whose sum is σ = 53003177640. Its totient is φ = 49469632408.

The previous prime is 51236404987. The next prime is 51236405027. The reversal of 51236405023 is 32050463215.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51236405023 - 2¹⁷ = 51236273951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51236405027) 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, 883386265 + ... + 883386322.

It is an arithmetic number, because the mean of its divisors is an integer number (13250794410).

Almost surely, 2^51236405023 is an apocalyptic number.

51236405023 is a deficient number, since it is larger than the sum of its proper divisors (1766772617).

51236405023 is a wasteful number, since it uses less digits than its factorization.

51236405023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766772616.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 51236405023 its reverse (32050463215), we get a palindrome (83286868238).

It can be divided in two parts, 5123 and 6405023, that added together give a palindrome (6410146).

The spelling of 51236405023 in words is "fifty-one billion, two hundred thirty-six million, four hundred five thousand, twenty-three".