1626256491 has 16 divisors (see below), whose sum is σ = 2200504320. Its totient is φ = 1068112640.

The previous prime is 1626256487. The next prime is 1626256543. The reversal of 1626256491 is 1946526261.

It is not a de Polignac number, because 1626256491 - 2² = 1626256487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1626256451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482470 + ... + 485828.

It is an arithmetic number, because the mean of its divisors is an integer number (137531520).

Almost surely, 2^1626256491 is an apocalyptic number.

1626256491 is a deficient number, since it is larger than the sum of its proper divisors (574247829).

1626256491 is a wasteful number, since it uses less digits than its factorization.

1626256491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5706.

The product of its digits is 155520, while the sum is 42.

The square root of 1626256491 is about 40326.8705827764. The cubic root of 1626256491 is about 1175.9702843445.

The spelling of 1626256491 in words is "one billion, six hundred twenty-six million, two hundred fifty-six thousand, four hundred ninety-one".