51405020231 has 2 divisors, whose sum is σ = 51405020232. Its totient is φ = 51405020230.

The previous prime is 51405020209. The next prime is 51405020243. The reversal of 51405020231 is 13202050415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51405020231 - 2¹⁰ = 51405019207 is a prime.

It is a super-2 number, since 2×51405020231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51405020197 and 51405020206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51405020131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702510115 + 25702510116.

It is an arithmetic number, because the mean of its divisors is an integer number (25702510116).

Almost surely, 2^51405020231 is an apocalyptic number.

51405020231 is a deficient number, since it is larger than the sum of its proper divisors (1).

51405020231 is an equidigital number, since it uses as much as digits as its factorization.

51405020231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 51405020231 its reverse (13202050415), we get a palindrome (64607070646).

The spelling of 51405020231 in words is "fifty-one billion, four hundred five million, twenty thousand, two hundred thirty-one".