617128755431 has 2 divisors, whose sum is σ = 617128755432. Its totient is φ = 617128755430.

The previous prime is 617128755421. The next prime is 617128755487. The reversal of 617128755431 is 134557821716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 617128755431 - 2²⁶ = 617061646567 is a prime.

It is a super-2 number, since 2×617128755431² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 617128755431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617128755421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308564377715 + 308564377716.

It is an arithmetic number, because the mean of its divisors is an integer number (308564377716).

Almost surely, 2^617128755431 is an apocalyptic number.

617128755431 is a deficient number, since it is larger than the sum of its proper divisors (1).

617128755431 is an equidigital number, since it uses as much as digits as its factorization.

617128755431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 50.

The spelling of 617128755431 in words is "six hundred seventeen billion, one hundred twenty-eight million, seven hundred fifty-five thousand, four hundred thirty-one".