1615108961 has 2 divisors, whose sum is σ = 1615108962. Its totient is φ = 1615108960.

The previous prime is 1615108883. The next prime is 1615108981. The reversal of 1615108961 is 1698015161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 895206400 + 719902561 = 29920^2 + 26831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1615108961 - 2¹⁰ = 1615107937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1615108981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 807554480 + 807554481.

It is an arithmetic number, because the mean of its divisors is an integer number (807554481).

Almost surely, 2^1615108961 is an apocalyptic number.

It is an amenable number.

1615108961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1615108961 is an equidigital number, since it uses as much as digits as its factorization.

1615108961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1615108961 is about 40188.4182445639. The cubic root of 1615108961 is about 1173.2771397112.

The spelling of 1615108961 in words is "one billion, six hundred fifteen million, one hundred eight thousand, nine hundred sixty-one".