40581731 has 2 divisors, whose sum is σ = 40581732. Its totient is φ = 40581730.

The previous prime is 40581721. The next prime is 40581733. The reversal of 40581731 is 13718504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40581731 - 2¹⁴ = 40565347 is a prime.

It is a super-2 number, since 2×40581731² = 3293753781912722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40581733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40581694 and 40581703.

It is not a weakly prime, because it can be changed into another prime (40581733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20290865 + 20290866.

It is an arithmetic number, because the mean of its divisors is an integer number (20290866).

Almost surely, 2^40581731 is an apocalyptic number.

40581731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40581731 is an equidigital number, since it uses as much as digits as its factorization.

40581731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 40581731 is about 6370.3791880861. The cubic root of 40581731 is about 343.6451265312.

The spelling of 40581731 in words is "forty million, five hundred eighty-one thousand, seven hundred thirty-one".