538640731 has 2 divisors, whose sum is σ = 538640732. Its totient is φ = 538640730.

The previous prime is 538640681. The next prime is 538640737. The reversal of 538640731 is 137046835.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 538640731 - 2¹⁷ = 538509659 is a prime.

It is a super-2 number, since 2×538640731² = 580267674184428722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (538640737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269320365 + 269320366.

It is an arithmetic number, because the mean of its divisors is an integer number (269320366).

Almost surely, 2^538640731 is an apocalyptic number.

538640731 is a deficient number, since it is larger than the sum of its proper divisors (1).

538640731 is an equidigital number, since it uses as much as digits as its factorization.

538640731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 538640731 is about 23208.6348370601. The cubic root of 538640731 is about 813.6414472280.

The spelling of 538640731 in words is "five hundred thirty-eight million, six hundred forty thousand, seven hundred thirty-one".