614661391 has 2 divisors, whose sum is σ = 614661392. Its totient is φ = 614661390.

The previous prime is 614661371. The next prime is 614661497. The reversal of 614661391 is 193166416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 614661391 - 2¹⁹ = 614137103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 614661391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (614661371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307330695 + 307330696.

It is an arithmetic number, because the mean of its divisors is an integer number (307330696).

Almost surely, 2^614661391 is an apocalyptic number.

614661391 is a deficient number, since it is larger than the sum of its proper divisors (1).

614661391 is an equidigital number, since it uses as much as digits as its factorization.

614661391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 614661391 is about 24792.3655789439. The cubic root of 614661391 is about 850.2473978825.

The spelling of 614661391 in words is "six hundred fourteen million, six hundred sixty-one thousand, three hundred ninety-one".