118161521 has 2 divisors, whose sum is σ = 118161522. Its totient is φ = 118161520.

The previous prime is 118161503. The next prime is 118161581. The reversal of 118161521 is 125161811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86397025 + 31764496 = 9295^2 + 5636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118161521 is a prime.

It is not a weakly prime, because it can be changed into another prime (118161581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59080760 + 59080761.

It is an arithmetic number, because the mean of its divisors is an integer number (59080761).

Almost surely, 2^118161521 is an apocalyptic number.

It is an amenable number.

118161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

118161521 is an equidigital number, since it uses as much as digits as its factorization.

118161521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 26.

The square root of 118161521 is about 10870.2125554195. The cubic root of 118161521 is about 490.7105075032.

The spelling of 118161521 in words is "one hundred eighteen million, one hundred sixty-one thousand, five hundred twenty-one".