115120213561 has 2 divisors, whose sum is σ = 115120213562. Its totient is φ = 115120213560.

The previous prime is 115120213531. The next prime is 115120213613. The reversal of 115120213561 is 165312021511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73146447936 + 41973765625 = 270456^2 + 204875^2 .

It is a cyclic number.

It is not a de Polignac number, because 115120213561 - 2¹⁷ = 115120082489 is a prime.

It is not a weakly prime, because it can be changed into another prime (115120213531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57560106780 + 57560106781.

It is an arithmetic number, because the mean of its divisors is an integer number (57560106781).

Almost surely, 2^115120213561 is an apocalyptic number.

It is an amenable number.

115120213561 is a deficient number, since it is larger than the sum of its proper divisors (1).

115120213561 is an equidigital number, since it uses as much as digits as its factorization.

115120213561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 115120213561 in words is "one hundred fifteen billion, one hundred twenty million, two hundred thirteen thousand, five hundred sixty-one".