614431891 has 2 divisors, whose sum is σ = 614431892. Its totient is φ = 614431890.

The previous prime is 614431877. The next prime is 614431921. The reversal of 614431891 is 198134416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 614431891 - 2²³ = 606043283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 614431891.

It is not a weakly prime, because it can be changed into another prime (614431991) 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 as a sum of consecutive naturals, namely, 307215945 + 307215946.

It is an arithmetic number, because the mean of its divisors is an integer number (307215946).

Almost surely, 2^614431891 is an apocalyptic number.

614431891 is a deficient number, since it is larger than the sum of its proper divisors (1).

614431891 is an equidigital number, since it uses as much as digits as its factorization.

614431891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 614431891 is about 24787.7367058794. The cubic root of 614431891 is about 850.1415639651.

The spelling of 614431891 in words is "six hundred fourteen million, four hundred thirty-one thousand, eight hundred ninety-one".