523157491 has 4 divisors (see below), whose sum is σ = 524560432. Its totient is φ = 521754552.

The previous prime is 523157489. The next prime is 523157501. The reversal of 523157491 is 194751325.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 523157491 - 2¹ = 523157489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 523157491.

It is not an unprimeable number, because it can be changed into a prime (523158491) 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, 700911 + ... + 701656.

It is an arithmetic number, because the mean of its divisors is an integer number (131140108).

Almost surely, 2^523157491 is an apocalyptic number.

523157491 is a deficient number, since it is larger than the sum of its proper divisors (1402941).

523157491 is a wasteful number, since it uses less digits than its factorization.

523157491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402940.

The product of its digits is 37800, while the sum is 37.

The square root of 523157491 is about 22872.6362931779. The cubic root of 523157491 is about 805.7694845144.

The spelling of 523157491 in words is "five hundred twenty-three million, one hundred fifty-seven thousand, four hundred ninety-one".