615563231 has 2 divisors, whose sum is σ = 615563232. Its totient is φ = 615563230.

The previous prime is 615563219. The next prime is 615563243. The reversal of 615563231 is 132365516.

It is a balanced prime because it is at equal distance from previous prime (615563219) and next prime (615563243).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-615563231 is a prime.

It is a super-2 number, since 2×615563231² = 757836182718318722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615563281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307781615 + 307781616.

It is an arithmetic number, because the mean of its divisors is an integer number (307781616).

Almost surely, 2^615563231 is an apocalyptic number.

615563231 is a deficient number, since it is larger than the sum of its proper divisors (1).

615563231 is an equidigital number, since it uses as much as digits as its factorization.

615563231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 615563231 is about 24810.5467694688. The cubic root of 615563231 is about 850.6630263983.

The spelling of 615563231 in words is "six hundred fifteen million, five hundred sixty-three thousand, two hundred thirty-one".