913738521 has 4 divisors (see below), whose sum is σ = 1218318032. Its totient is φ = 609159012.

The previous prime is 913738517. The next prime is 913738531. The reversal of 913738521 is 125837319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 913738521 - 2² = 913738517 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 913738521.

It is not an unprimeable number, because it can be changed into a prime (913738531) 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, 152289751 + ... + 152289756.

It is an arithmetic number, because the mean of its divisors is an integer number (304579508).

Almost surely, 2^913738521 is an apocalyptic number.

It is an amenable number.

913738521 is a deficient number, since it is larger than the sum of its proper divisors (304579511).

913738521 is a wasteful number, since it uses less digits than its factorization.

913738521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304579510.

The product of its digits is 45360, while the sum is 39.

The square root of 913738521 is about 30228.1081280321. The cubic root of 913738521 is about 970.3773361013.

The spelling of 913738521 in words is "nine hundred thirteen million, seven hundred thirty-eight thousand, five hundred twenty-one".