157122561 has 8 divisors (see below), whose sum is σ = 209826144. Its totient is φ = 104583680.

The previous prime is 157122529. The next prime is 157122577. The reversal of 157122561 is 165221751.

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

It is a cyclic number.

It is not a de Polignac number, because 157122561 - 2⁵ = 157122529 is a prime.

It is a super-3 number, since 3×157122561³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (157122961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38931 + ... + 42776.

It is an arithmetic number, because the mean of its divisors is an integer number (26228268).

It is a Proth number, since it is equal to 4795 ⋅ 2¹⁵ + 1 and 4795 < 2¹⁵.

Almost surely, 2^157122561 is an apocalyptic number.

It is an amenable number.

157122561 is a deficient number, since it is larger than the sum of its proper divisors (52703583).

157122561 is an equidigital number, since it uses as much as digits as its factorization.

157122561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82351.

The product of its digits is 4200, while the sum is 30.

The square root of 157122561 is about 12534.8538483702. The cubic root of 157122561 is about 539.6094123393.

The spelling of 157122561 in words is "one hundred fifty-seven million, one hundred twenty-two thousand, five hundred sixty-one".