161313157 has 4 divisors (see below), whose sum is σ = 161399916. Its totient is φ = 161226400.

The previous prime is 161313151. The next prime is 161313161. The reversal of 161313157 is 751313161.

161313157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28579716 + 132733441 = 5346^2 + 11521^2 .

It is a cyclic number.

It is not a de Polignac number, because 161313157 - 2⁷ = 161313029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161313151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40528 + ... + 44329.

It is an arithmetic number, because the mean of its divisors is an integer number (40349979).

Almost surely, 2^161313157 is an apocalyptic number.

It is an amenable number.

161313157 is a deficient number, since it is larger than the sum of its proper divisors (86759).

161313157 is an equidigital number, since it uses as much as digits as its factorization.

161313157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86758.

The product of its digits is 1890, while the sum is 28.

The square root of 161313157 is about 12700.9116601920. The cubic root of 161313157 is about 544.3646688503.

The spelling of 161313157 in words is "one hundred sixty-one million, three hundred thirteen thousand, one hundred fifty-seven".