972519157 has 4 divisors (see below), whose sum is σ = 988462156. Its totient is φ = 956576160.

The previous prime is 972519133. The next prime is 972519167. The reversal of 972519157 is 751915279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751915279 = 12037 ⋅62467.

It can be written as a sum of positive squares in 2 ways, for example, as 172817316 + 799701841 = 13146^2 + 28279^2 .

It is a cyclic number.

It is not a de Polignac number, because 972519157 - 2¹⁹ = 971994869 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 (972519127) 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, 7971408 + ... + 7971529.

It is an arithmetic number, because the mean of its divisors is an integer number (247115539).

Almost surely, 2^972519157 is an apocalyptic number.

It is an amenable number.

972519157 is a deficient number, since it is larger than the sum of its proper divisors (15942999).

972519157 is a wasteful number, since it uses less digits than its factorization.

972519157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15942998.

The product of its digits is 198450, while the sum is 46.

The square root of 972519157 is about 31185.2394090538. The cubic root of 972519157 is about 990.7545032219.

It can be divided in two parts, 9725 and 19157, that added together give a palindrome (28882).

The spelling of 972519157 in words is "nine hundred seventy-two million, five hundred nineteen thousand, one hundred fifty-seven".