991293375 has 64 divisors (see below), whose sum is σ = 1761357312. Its totient is φ = 493376000.

The previous prime is 991293349. The next prime is 991293389. The reversal of 991293375 is 573392199.

It is not a de Polignac number, because 991293375 - 2¹² = 991289279 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 834532 + ... + 835718.

It is an arithmetic number, because the mean of its divisors is an integer number (27521208).

Almost surely, 2^991293375 is an apocalyptic number.

991293375 is a deficient number, since it is larger than the sum of its proper divisors (770063937).

991293375 is a wasteful number, since it uses less digits than its factorization.

991293375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353 (or 1343 counting only the distinct ones).

The product of its digits is 459270, while the sum is 48.

The square root of 991293375 is about 31484.8118145877. The cubic root of 991293375 is about 997.0893278742.

The spelling of 991293375 in words is "nine hundred ninety-one million, two hundred ninety-three thousand, three hundred seventy-five".