617731420071539 has 2 divisors, whose sum is σ = 617731420071540. Its totient is φ = 617731420071538.

The previous prime is 617731420071487. The next prime is 617731420071551. The reversal of 617731420071539 is 935170024137716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 617731420071539 - 2⁴⁸ = 336256443360883 is a prime.

It is a super-2 number, since 2×617731420071539² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (617731420071559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308865710035769 + 308865710035770.

It is an arithmetic number, because the mean of its divisors is an integer number (308865710035770).

Almost surely, 2^{617731420071539} is an apocalyptic number.

617731420071539 is a deficient number, since it is larger than the sum of its proper divisors (1).

617731420071539 is an equidigital number, since it uses as much as digits as its factorization.

617731420071539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6667920, while the sum is 56.

The spelling of 617731420071539 in words is "six hundred seventeen trillion, seven hundred thirty-one billion, four hundred twenty million, seventy-one thousand, five hundred thirty-nine".