157577221 has 4 divisors (see below), whose sum is σ = 157607212. Its totient is φ = 157547232.

The previous prime is 157577183. The next prime is 157577281. The reversal of 157577221 is 122775751.

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 7784100 + 149793121 = 2790^2 + 12239^2 .

It is a cyclic number.

It is not a de Polignac number, because 157577221 - 2¹³ = 157569029 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 (157577281) 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, 4806 + ... + 18391.

It is an arithmetic number, because the mean of its divisors is an integer number (39401803).

Almost surely, 2^157577221 is an apocalyptic number.

It is an amenable number.

157577221 is a deficient number, since it is larger than the sum of its proper divisors (29991).

157577221 is an equidigital number, since it uses as much as digits as its factorization.

157577221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29990.

The product of its digits is 34300, while the sum is 37.

The square root of 157577221 is about 12552.9765792819. The cubic root of 157577221 is about 540.1293940038.

The spelling of 157577221 in words is "one hundred fifty-seven million, five hundred seventy-seven thousand, two hundred twenty-one".