3691129391 has 2 divisors, whose sum is σ = 3691129392. Its totient is φ = 3691129390.

The previous prime is 3691129303. The next prime is 3691129399. The reversal of 3691129391 is 1939211963.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3691129391 - 2²⁶ = 3624020527 is a prime.

It is a super-2 number, since 2×3691129391² = 27248872362208061762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3691129399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1845564695 + 1845564696.

It is an arithmetic number, because the mean of its divisors is an integer number (1845564696).

Almost surely, 2^3691129391 is an apocalyptic number.

3691129391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3691129391 is an equidigital number, since it uses as much as digits as its factorization.

3691129391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 44.

The square root of 3691129391 is about 60754.6655903890. The cubic root of 3691129391 is about 1545.4433489197.

The spelling of 3691129391 in words is "three billion, six hundred ninety-one million, one hundred twenty-nine thousand, three hundred ninety-one".