1291517627 has 2 divisors, whose sum is σ = 1291517628. Its totient is φ = 1291517626.

The previous prime is 1291517587. The next prime is 1291517651. The reversal of 1291517627 is 7267151921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291517627 - 2²⁰ = 1290469051 is a prime.

It is a super-2 number, since 2×1291517627² = 3336035561703422258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1291517027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645758813 + 645758814.

It is an arithmetic number, because the mean of its divisors is an integer number (645758814).

Almost surely, 2^1291517627 is an apocalyptic number.

1291517627 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291517627 is an equidigital number, since it uses as much as digits as its factorization.

1291517627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 41.

The square root of 1291517627 is about 35937.6908968843. The cubic root of 1291517627 is about 1089.0139574681.

The spelling of 1291517627 in words is "one billion, two hundred ninety-one million, five hundred seventeen thousand, six hundred twenty-seven".