999053391 has 32 divisors (see below), whose sum is σ = 1581189120. Its totient is φ = 549179136.

The previous prime is 999053387. The next prime is 999053401. The reversal of 999053391 is 193350999.

It is a happy number.

It is not a de Polignac number, because 999053391 - 2² = 999053387 is a prime.

999053391 is a modest number, since divided by 53391 gives 999 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 999053391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999053311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61930 + ... + 76376.

It is an arithmetic number, because the mean of its divisors is an integer number (49412160).

Almost surely, 2^999053391 is an apocalyptic number.

999053391 is a deficient number, since it is larger than the sum of its proper divisors (582135729).

999053391 is a wasteful number, since it uses less digits than its factorization.

999053391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14583.

The product of its (nonzero) digits is 295245, while the sum is 48.

The square root of 999053391 is about 31607.8058555161. The cubic root of 999053391 is about 999.6843640511.

The spelling of 999053391 in words is "nine hundred ninety-nine million, fifty-three thousand, three hundred ninety-one".