51505605031 has 2 divisors, whose sum is σ = 51505605032. Its totient is φ = 51505605030.

The previous prime is 51505604971. The next prime is 51505605071. The reversal of 51505605031 is 13050650515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51505605031 - 2²⁷ = 51371387303 is a prime.

It is a super-2 number, since 2×51505605031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51505604984 and 51505605002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51505605071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25752802515 + 25752802516.

It is an arithmetic number, because the mean of its divisors is an integer number (25752802516).

Almost surely, 2^51505605031 is an apocalyptic number.

51505605031 is a deficient number, since it is larger than the sum of its proper divisors (1).

51505605031 is an equidigital number, since it uses as much as digits as its factorization.

51505605031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 51505605031 in words is "fifty-one billion, five hundred five million, six hundred five thousand, thirty-one".