991479357 has 24 divisors (see below), whose sum is σ = 1583744448. Its totient is φ = 592660800.

The previous prime is 991479341. The next prime is 991479371. The reversal of 991479357 is 753974199.

It is a happy number.

It is not a de Polignac number, because 991479357 - 2⁴ = 991479341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991479397) 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, 61369 + ... + 75822.

It is an arithmetic number, because the mean of its divisors is an integer number (65989352).

Almost surely, 2^991479357 is an apocalyptic number.

It is an amenable number.

991479357 is a deficient number, since it is larger than the sum of its proper divisors (592265091).

991479357 is a wasteful number, since it uses less digits than its factorization.

991479357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137281 (or 137278 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 54.

The square root of 991479357 is about 31487.7651953898. The cubic root of 991479357 is about 997.1516804451.

The spelling of 991479357 in words is "nine hundred ninety-one million, four hundred seventy-nine thousand, three hundred fifty-seven".