161157157 has 8 divisors (see below), whose sum is σ = 184369536. Its totient is φ = 137992272.

The previous prime is 161157133. The next prime is 161157179. The reversal of 161157157 is 751751161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161157157 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 (161157197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4273 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (23046192).

Almost surely, 2^161157157 is an apocalyptic number.

It is an amenable number.

161157157 is a deficient number, since it is larger than the sum of its proper divisors (23212379).

161157157 is a wasteful number, since it uses less digits than its factorization.

161157157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23747.

The product of its digits is 7350, while the sum is 34.

The square root of 161157157 is about 12694.7688832842. The cubic root of 161157157 is about 544.1891339275.

The spelling of 161157157 in words is "one hundred sixty-one million, one hundred fifty-seven thousand, one hundred fifty-seven".