41691989 has 2 divisors, whose sum is σ = 41691990. Its totient is φ = 41691988.

The previous prime is 41691943. The next prime is 41692003. The reversal of 41691989 is 98919614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 24964 = 6455^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 41691989 - 2⁸ = 41691733 is a prime.

It is a super-2 number, since 2×41691989² = 3476443893552242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41691919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20845994 + 20845995.

It is an arithmetic number, because the mean of its divisors is an integer number (20845995).

Almost surely, 2^41691989 is an apocalyptic number.

It is an amenable number.

41691989 is a deficient number, since it is larger than the sum of its proper divisors (1).

41691989 is an equidigital number, since it uses as much as digits as its factorization.

41691989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 41691989 is about 6456.9334052629. The cubic root of 41691989 is about 346.7508530542.

The spelling of 41691989 in words is "forty-one million, six hundred ninety-one thousand, nine hundred eighty-nine".