51032020431 has 16 divisors (see below), whose sum is σ = 81144082944. Its totient is φ = 27893277984.

The previous prime is 51032020411. The next prime is 51032020471. The reversal of 51032020431 is 13402023015.

It is not a de Polignac number, because 51032020431 - 2⁹ = 51032019919 is a prime.

It is a super-2 number, since 2×51032020431² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 51032020398 and 51032020407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51032020411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52827696 + ... + 52828661.

It is an arithmetic number, because the mean of its divisors is an integer number (5071505184).

Almost surely, 2^51032020431 is an apocalyptic number.

51032020431 is a deficient number, since it is larger than the sum of its proper divisors (30112062513).

51032020431 is a wasteful number, since it uses less digits than its factorization.

51032020431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105656390.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 51032020431 its reverse (13402023015), we get a palindrome (64434043446).

The spelling of 51032020431 in words is "fifty-one billion, thirty-two million, twenty thousand, four hundred thirty-one".