1317578623 has 2 divisors, whose sum is σ = 1317578624. Its totient is φ = 1317578622.

The previous prime is 1317578543. The next prime is 1317578629. The reversal of 1317578623 is 3268757131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1317578623 is a prime.

It is a super-2 number, since 2×1317578623² = 3472026855573152258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1317578623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317578629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658789311 + 658789312.

It is an arithmetic number, because the mean of its divisors is an integer number (658789312).

Almost surely, 2^1317578623 is an apocalyptic number.

1317578623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317578623 is an equidigital number, since it uses as much as digits as its factorization.

1317578623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The square root of 1317578623 is about 36298.4658491237. The cubic root of 1317578623 is about 1096.2901532454.

The spelling of 1317578623 in words is "one billion, three hundred seventeen million, five hundred seventy-eight thousand, six hundred twenty-three".