40981657 has 2 divisors, whose sum is σ = 40981658. Its totient is φ = 40981656.

The previous prime is 40981631. The next prime is 40981663. The reversal of 40981657 is 75618904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32478601 + 8503056 = 5699^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 40981657 - 2⁷ = 40981529 is a prime.

It is not a weakly prime, because it can be changed into another prime (40981687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490828 + 20490829.

It is an arithmetic number, because the mean of its divisors is an integer number (20490829).

Almost surely, 2^40981657 is an apocalyptic number.

It is an amenable number.

40981657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40981657 is an equidigital number, since it uses as much as digits as its factorization.

40981657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 40981657 is about 6401.6917295352. The cubic root of 40981657 is about 344.7702930759.

The spelling of 40981657 in words is "forty million, nine hundred eighty-one thousand, six hundred fifty-seven".