40731331 has 2 divisors, whose sum is σ = 40731332. Its totient is φ = 40731330.

The previous prime is 40731311. The next prime is 40731389. The reversal of 40731331 is 13313704.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40731331 is a prime.

It is a super-2 number, since 2×40731331² = 3318082650063122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40731311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20365665 + 20365666.

It is an arithmetic number, because the mean of its divisors is an integer number (20365666).

Almost surely, 2^40731331 is an apocalyptic number.

40731331 is a deficient number, since it is larger than the sum of its proper divisors (1).

40731331 is an equidigital number, since it uses as much as digits as its factorization.

40731331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 40731331 is about 6382.1102309503. The cubic root of 40731331 is about 344.0668784474.

The spelling of 40731331 in words is "forty million, seven hundred thirty-one thousand, three hundred thirty-one".