5991731 has 2 divisors, whose sum is σ = 5991732. Its totient is φ = 5991730.

The previous prime is 5991721. The next prime is 5991757. The reversal of 5991731 is 1371995.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5991731 is a prime.

It is a super-2 number, since 2×5991731² = 71801680752722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 5991691 and 5991700.

It is not a weakly prime, because it can be changed into another prime (5991721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2995865 + 2995866.

It is an arithmetic number, because the mean of its divisors is an integer number (2995866).

Almost surely, 2^5991731 is an apocalyptic number.

5991731 is a deficient number, since it is larger than the sum of its proper divisors (1).

5991731 is an equidigital number, since it uses as much as digits as its factorization.

5991731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505, while the sum is 35.

The square root of 5991731 is about 2447.8012582724. The cubic root of 5991731 is about 181.6285444046.

The spelling of 5991731 in words is "five million, nine hundred ninety-one thousand, seven hundred thirty-one".