40999661 has 2 divisors, whose sum is σ = 40999662. Its totient is φ = 40999660.

The previous prime is 40999633. The next prime is 40999667. The reversal of 40999661 is 16699904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22033636 + 18966025 = 4694^2 + 4355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40999661 is a prime.

It is a super-2 number, since 2×40999661² = 3361944404229842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40999667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20499830 + 20499831.

It is an arithmetic number, because the mean of its divisors is an integer number (20499831).

Almost surely, 2^40999661 is an apocalyptic number.

It is an amenable number.

40999661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40999661 is an equidigital number, since it uses as much as digits as its factorization.

40999661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 40999661 is about 6403.0977659255. The cubic root of 40999661 is about 344.8207736733.

The spelling of 40999661 in words is "forty million, nine hundred ninety-nine thousand, six hundred sixty-one".