115661401 has 2 divisors, whose sum is σ = 115661402. Its totient is φ = 115661400.

The previous prime is 115661393. The next prime is 115661431. The reversal of 115661401 is 104166511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101606400 + 14055001 = 10080^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 115661401 - 2³ = 115661393 is a prime.

It is not a weakly prime, because it can be changed into another prime (115661431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57830700 + 57830701.

It is an arithmetic number, because the mean of its divisors is an integer number (57830701).

Almost surely, 2^115661401 is an apocalyptic number.

It is an amenable number.

115661401 is a deficient number, since it is larger than the sum of its proper divisors (1).

115661401 is an equidigital number, since it uses as much as digits as its factorization.

115661401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 115661401 is about 10754.5990627266. The cubic root of 115661401 is about 487.2249086594.

The spelling of 115661401 in words is "one hundred fifteen million, six hundred sixty-one thousand, four hundred one".