161481601 has 2 divisors, whose sum is σ = 161481602. Its totient is φ = 161481600.

The previous prime is 161481587. The next prime is 161481629. The reversal of 161481601 is 106184161.

It is an a-pointer prime, because the next prime (161481629) can be obtained adding 161481601 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118919025 + 42562576 = 10905^2 + 6524^2 .

It is a cyclic number.

It is not a de Polignac number, because 161481601 - 2⁵ = 161481569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161481601.

It is not a weakly prime, because it can be changed into another prime (161481401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80740800 + 80740801.

It is an arithmetic number, because the mean of its divisors is an integer number (80740801).

Almost surely, 2^161481601 is an apocalyptic number.

It is an amenable number.

161481601 is a deficient number, since it is larger than the sum of its proper divisors (1).

161481601 is an equidigital number, since it uses as much as digits as its factorization.

161481601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 161481601 is about 12707.5411075471. The cubic root of 161481601 is about 544.5540790352.

The spelling of 161481601 in words is "one hundred sixty-one million, four hundred eighty-one thousand, six hundred one".