157252121 has 8 divisors (see below), whose sum is σ = 169479240. Its totient is φ = 145043712.

The previous prime is 157252111. The next prime is 157252129. The reversal of 157252121 is 121252751.

It can be written as a sum of positive squares in 4 ways, for example, as 25600 + 157226521 = 160^2 + 12539^2 .

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-157252121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157252129) 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, 16295 + ... + 24083.

It is an arithmetic number, because the mean of its divisors is an integer number (21184905).

Almost surely, 2^157252121 is an apocalyptic number.

It is an amenable number.

157252121 is a deficient number, since it is larger than the sum of its proper divisors (12227119).

157252121 is a wasteful number, since it uses less digits than its factorization.

157252121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9355.

The product of its digits is 1400, while the sum is 26.

The square root of 157252121 is about 12540.0207735075. The cubic root of 157252121 is about 539.7576884958.

The spelling of 157252121 in words is "one hundred fifty-seven million, two hundred fifty-two thousand, one hundred twenty-one".