615491 has 2 divisors, whose sum is σ = 615492. Its totient is φ = 615490.

The previous prime is 615479. The next prime is 615493. The reversal of 615491 is 194516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 615491 - 2⁶ = 615427 is a prime.

Together with 615493, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 615491.

It is not a weakly prime, because it can be changed into another prime (615493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307745 + 307746.

It is an arithmetic number, because the mean of its divisors is an integer number (307746).

2⁶¹⁵⁴⁹¹ is an apocalyptic number.

615491 is a deficient number, since it is larger than the sum of its proper divisors (1).

615491 is an equidigital number, since it uses as much as digits as its factorization.

615491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 615491 is about 784.5323447762. The cubic root of 615491 is about 85.0629752457.

The spelling of 615491 in words is "six hundred fifteen thousand, four hundred ninety-one".