161561359 has 2 divisors, whose sum is σ = 161561360. Its totient is φ = 161561358.

The previous prime is 161561347. The next prime is 161561369. The reversal of 161561359 is 953165161.

161561359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161561359 - 2⁵ = 161561327 is a prime.

It is a super-2 number, since 2×161561359² = 52204145443853762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161561369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80780679 + 80780680.

It is an arithmetic number, because the mean of its divisors is an integer number (80780680).

Almost surely, 2^161561359 is an apocalyptic number.

161561359 is a deficient number, since it is larger than the sum of its proper divisors (1).

161561359 is an equidigital number, since it uses as much as digits as its factorization.

161561359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 37.

The square root of 161561359 is about 12710.6789354464. The cubic root of 161561359 is about 544.6437185468.

The spelling of 161561359 in words is "one hundred sixty-one million, five hundred sixty-one thousand, three hundred fifty-nine".