157979761 has 3 divisors (see below), whose sum is σ = 157992331. Its totient is φ = 157967192.

The previous prime is 157979753. The next prime is 157979777. The reversal of 157979761 is 167979751.

The square root of 157979761 is 12569.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 167979751 = 9311 ⋅18041.

It can be written as a sum of positive squares in only one way, i.e., 156725361 + 1254400 = 12519^2 + 1120^2 .

It is not a de Polignac number, because 157979761 - 2³ = 157979753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157979699 and 157979708.

It is not an unprimeable number, because it can be changed into a prime (157949761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6285 + ... + 18853.

Almost surely, 2^157979761 is an apocalyptic number.

157979761 is the 12569-th square number.

157979761 is the 6285-th centered octagonal number.

It is an amenable number.

157979761 is a deficient number, since it is larger than the sum of its proper divisors (12570).

157979761 is an frugal number, since it uses more digits than its factorization.

157979761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25138 (or 12569 counting only the distinct ones).

The product of its digits is 833490, while the sum is 52.

The cubic root of 157979761 is about 540.5889333686.

The spelling of 157979761 in words is "one hundred fifty-seven million, nine hundred seventy-nine thousand, seven hundred sixty-one".