157721053 has 24 divisors (see below), whose sum is σ = 200993400. Its totient is φ = 122830848.

The previous prime is 157721041. The next prime is 157721077. The reversal of 157721053 is 350127751.

It can be written as a sum of positive squares in 4 ways, for example, as 14607684 + 143113369 = 3822^2 + 11963^2 .

It is not a de Polignac number, because 157721053 - 2¹⁷ = 157589981 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 (157721153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20893 + ... + 27421.

It is an arithmetic number, because the mean of its divisors is an integer number (8374725).

Almost surely, 2^157721053 is an apocalyptic number.

It is an amenable number.

157721053 is a deficient number, since it is larger than the sum of its proper divisors (43272347).

157721053 is a wasteful number, since it uses less digits than its factorization.

157721053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6589 (or 6582 counting only the distinct ones).

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 157721053 is about 12558.7042723364. The cubic root of 157721053 is about 540.2936822712.

The spelling of 157721053 in words is "one hundred fifty-seven million, seven hundred twenty-one thousand, fifty-three".