161098501 has 2 divisors, whose sum is σ = 161098502. Its totient is φ = 161098500.

The previous prime is 161098411. The next prime is 161098519. The reversal of 161098501 is 105890161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145178401 + 15920100 = 12049^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 161098501 - 2²⁷ = 26880773 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161098541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80549250 + 80549251.

It is an arithmetic number, because the mean of its divisors is an integer number (80549251).

Almost surely, 2^161098501 is an apocalyptic number.

It is an amenable number.

161098501 is a deficient number, since it is larger than the sum of its proper divisors (1).

161098501 is an equidigital number, since it uses as much as digits as its factorization.

161098501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 161098501 is about 12692.4584301072. The cubic root of 161098501 is about 544.1231034931.

The spelling of 161098501 in words is "one hundred sixty-one million, ninety-eight thousand, five hundred one".