31004311 has 16 divisors (see below), whose sum is σ = 36033984. Its totient is φ = 26417664.

The previous prime is 31004279. The next prime is 31004321. The reversal of 31004311 is 11340013.

It is not a de Polignac number, because 31004311 - 2⁵ = 31004279 is a prime.

It is a super-2 number, since 2×31004311² = 1922534601169442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31004291 and 31004300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31004321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10390 + ... + 13036.

It is an arithmetic number, because the mean of its divisors is an integer number (2252124).

Almost surely, 2^31004311 is an apocalyptic number.

31004311 is a deficient number, since it is larger than the sum of its proper divisors (5029673).

31004311 is a wasteful number, since it uses less digits than its factorization.

31004311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31004311 is about 5568.1514886001. The cubic root of 31004311 is about 314.1526263835.

Adding to 31004311 its reverse (11340013), we get a palindrome (42344324).

The spelling of 31004311 in words is "thirty-one million, four thousand, three hundred eleven".