157079221 has 16 divisors (see below), whose sum is σ = 171419248. Its totient is φ = 143078400.

The previous prime is 157079207. The next prime is 157079231. The reversal of 157079221 is 122970751.

It can be written as a sum of positive squares in 8 ways, for example, as 47458321 + 109620900 = 6889^2 + 10470^2 .

It is a cyclic number.

It is not a de Polignac number, because 157079221 - 2¹³ = 157071029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157079231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566935 + ... + 567211.

It is an arithmetic number, because the mean of its divisors is an integer number (10713703).

Almost surely, 2^157079221 is an apocalyptic number.

It is an amenable number.

157079221 is a deficient number, since it is larger than the sum of its proper divisors (14340027).

157079221 is a wasteful number, since it uses less digits than its factorization.

157079221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 157079221 is about 12533.1249495088. The cubic root of 157079221 is about 539.5597932768.

The spelling of 157079221 in words is "one hundred fifty-seven million, seventy-nine thousand, two hundred twenty-one".