6745311531 has 30 divisors (see below), whose sum is σ = 11721451500. Its totient is φ = 3854461464.

The previous prime is 6745311491. The next prime is 6745311539. The reversal of 6745311531 is 1351135476.

6745311531 is a `hidden beast` number, since 6 + 74 + 53 + 1 + 1 + 531 = 666.

It is not a de Polignac number, because 6745311531 - 2⁷ = 6745311403 is a prime.

It is a super-2 number, since 2×6745311531² = 90998455300483127922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6745311539) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 845781 + ... + 853718.

It is an arithmetic number, because the mean of its divisors is an integer number (390715050).

Almost surely, 2^6745311531 is an apocalyptic number.

6745311531 is a deficient number, since it is larger than the sum of its proper divisors (4976139969).

6745311531 is a wasteful number, since it uses less digits than its factorization.

6745311531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699525 (or 1699509 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 6745311531 is about 82129.8455556809. The cubic root of 6745311531 is about 1889.4439104734.

The spelling of 6745311531 in words is "six billion, seven hundred forty-five million, three hundred eleven thousand, five hundred thirty-one".