8490507731 has 4 divisors (see below), whose sum is σ = 8497661832. Its totient is φ = 8483353632.

The previous prime is 8490507691. The next prime is 8490507763. The reversal of 8490507731 is 1377050948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8490507731 is a prime.

It is a super-2 number, since 2×8490507731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8490507331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575270 + ... + 3577643.

It is an arithmetic number, because the mean of its divisors is an integer number (2124415458).

Almost surely, 2^8490507731 is an apocalyptic number.

8490507731 is a deficient number, since it is larger than the sum of its proper divisors (7154101).

8490507731 is a wasteful number, since it uses less digits than its factorization.

8490507731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7154100.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 8490507731 is about 92143.9511362520. The cubic root of 8490507731 is about 2040.0675784194.

The spelling of 8490507731 in words is "eight billion, four hundred ninety million, five hundred seven thousand, seven hundred thirty-one".