3138621491 has 2 divisors, whose sum is σ = 3138621492. Its totient is φ = 3138621490.

The previous prime is 3138621397. The next prime is 3138621503. The reversal of 3138621491 is 1941268313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3138621491 - 2³⁰ = 2064879667 is a prime.

It is not a weakly prime, because it can be changed into another prime (3138624491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569310745 + 1569310746.

It is an arithmetic number, because the mean of its divisors is an integer number (1569310746).

Almost surely, 2^3138621491 is an apocalyptic number.

3138621491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138621491 is an equidigital number, since it uses as much as digits as its factorization.

3138621491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 3138621491 is about 56023.4012801793. The cubic root of 3138621491 is about 1464.1300291295.

The spelling of 3138621491 in words is "three billion, one hundred thirty-eight million, six hundred twenty-one thousand, four hundred ninety-one".