1626315491 has 2 divisors, whose sum is σ = 1626315492. Its totient is φ = 1626315490.

The previous prime is 1626315461. The next prime is 1626315499. The reversal of 1626315491 is 1945136261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1626315491 - 2¹⁸ = 1626053347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1626315499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813157745 + 813157746.

It is an arithmetic number, because the mean of its divisors is an integer number (813157746).

Almost surely, 2^1626315491 is an apocalyptic number.

1626315491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626315491 is an equidigital number, since it uses as much as digits as its factorization.

1626315491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 1626315491 is about 40327.6020983147. The cubic root of 1626315491 is about 1175.9845054320.

The spelling of 1626315491 in words is "one billion, six hundred twenty-six million, three hundred fifteen thousand, four hundred ninety-one".