615988963 has 2 divisors, whose sum is σ = 615988964. Its totient is φ = 615988962.

The previous prime is 615988957. The next prime is 615988979. The reversal of 615988963 is 369889516.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-615988963 is a prime.

It is not a weakly prime, because it can be changed into another prime (615988903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307994481 + 307994482.

It is an arithmetic number, because the mean of its divisors is an integer number (307994482).

Almost surely, 2^615988963 is an apocalyptic number.

615988963 is a deficient number, since it is larger than the sum of its proper divisors (1).

615988963 is an equidigital number, since it uses as much as digits as its factorization.

615988963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 55.

The square root of 615988963 is about 24819.1249442844. The cubic root of 615988963 is about 850.8590912893.

The spelling of 615988963 in words is "six hundred fifteen million, nine hundred eighty-eight thousand, nine hundred sixty-three".