7131312 has 30 divisors (see below), whose sum is σ = 19958172. Its totient is φ = 2377056.

The previous prime is 7131301. The next prime is 7131323. The reversal of 7131312 is 2131317.

It is an interprime number because it is at equal distance from previous prime (7131301) and next prime (7131323).

It is a super-2 number, since 2×7131312² = 101711221682688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24618 + ... + 24905.

Almost surely, 2^7131312 is an apocalyptic number.

7131312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

7131312 is an abundant number, since it is smaller than the sum of its proper divisors (12826860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7131312 is a wasteful number, since it uses less digits than its factorization.

7131312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49537 (or 49528 counting only the distinct ones).

The product of its digits is 126, while the sum is 18.

The square root of 7131312 is about 2670.4516471938. The cubic root of 7131312 is about 192.4818625740.

Adding to 7131312 its reverse (2131317), we get a palindrome (9262629).

It can be divided in two parts, 713 and 1312, that added together give a square (2025 = 45²).

The spelling of 7131312 in words is "seven million, one hundred thirty-one thousand, three hundred twelve".