991570004 has 24 divisors (see below), whose sum is σ = 1787887080. Its totient is φ = 480955904.

The previous prime is 991570003. The next prime is 991570007. The reversal of 991570004 is 400075199.

It can be written as a sum of positive squares in 4 ways, for example, as 310464400 + 681105604 = 17620^2 + 26098^2 .

It is a super-2 number, since 2×991570004² = 1966422145665120032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991570003) 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 7 ways as a sum of consecutive naturals, for example, 7409 + ... + 45144.

It is an arithmetic number, because the mean of its divisors is an integer number (74495295).

Almost surely, 2^991570004 is an apocalyptic number.

It is an amenable number.

991570004 is a deficient number, since it is larger than the sum of its proper divisors (796317076).

991570004 is a wasteful number, since it uses less digits than its factorization.

991570004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52699 (or 52697 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 991570004 is about 31489.2045628339. The cubic root of 991570004 is about 997.1820680517.

The spelling of 991570004 in words is "nine hundred ninety-one million, five hundred seventy thousand, four".