40131997 has 2 divisors, whose sum is σ = 40131998. Its totient is φ = 40131996.

The previous prime is 40131983. The next prime is 40132003. The reversal of 40131997 is 79913104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24019801 + 16112196 = 4901^2 + 4014^2 .

It is a cyclic number.

It is not a de Polignac number, because 40131997 - 2¹⁵ = 40099229 is a prime.

It is a super-2 number, since 2×40131997² = 3221154366416018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40131967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20065998 + 20065999.

It is an arithmetic number, because the mean of its divisors is an integer number (20065999).

Almost surely, 2^40131997 is an apocalyptic number.

It is an amenable number.

40131997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40131997 is an equidigital number, since it uses as much as digits as its factorization.

40131997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 40131997 is about 6334.9820047100. The cubic root of 40131997 is about 342.3709624553.

The spelling of 40131997 in words is "forty million, one hundred thirty-one thousand, nine hundred ninety-seven".