615042391 has 2 divisors, whose sum is σ = 615042392. Its totient is φ = 615042390.

The previous prime is 615042383. The next prime is 615042397. The reversal of 615042391 is 193240516.

615042391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 615042391 - 2³ = 615042383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615042397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307521195 + 307521196.

It is an arithmetic number, because the mean of its divisors is an integer number (307521196).

Almost surely, 2^615042391 is an apocalyptic number.

615042391 is a deficient number, since it is larger than the sum of its proper divisors (1).

615042391 is an equidigital number, since it uses as much as digits as its factorization.

615042391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 615042391 is about 24800.0482055983. The cubic root of 615042391 is about 850.4230378656.

The spelling of 615042391 in words is "six hundred fifteen million, forty-two thousand, three hundred ninety-one".