51521528291 has 2 divisors, whose sum is σ = 51521528292. Its totient is φ = 51521528290.

The previous prime is 51521528243. The next prime is 51521528297. The reversal of 51521528291 is 19282512515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51521528291 - 2²⁶ = 51454419427 is a prime.

It is not a weakly prime, because it can be changed into another prime (51521528297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760764145 + 25760764146.

It is an arithmetic number, because the mean of its divisors is an integer number (25760764146).

Almost surely, 2^51521528291 is an apocalyptic number.

51521528291 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521528291 is an equidigital number, since it uses as much as digits as its factorization.

51521528291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 41.

The spelling of 51521528291 in words is "fifty-one billion, five hundred twenty-one million, five hundred twenty-eight thousand, two hundred ninety-one".