42690913 has 2 divisors, whose sum is σ = 42690914. Its totient is φ = 42690912.

The previous prime is 42690887. The next prime is 42690919. The reversal of 42690913 is 31909624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33732864 + 8958049 = 5808^2 + 2993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42690913 is a prime.

It is not a weakly prime, because it can be changed into another prime (42690919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21345456 + 21345457.

It is an arithmetic number, because the mean of its divisors is an integer number (21345457).

Almost surely, 2^42690913 is an apocalyptic number.

It is an amenable number.

42690913 is a deficient number, since it is larger than the sum of its proper divisors (1).

42690913 is an equidigital number, since it uses as much as digits as its factorization.

42690913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 42690913 is about 6533.8283570966. The cubic root of 42690913 is about 349.4983643701.

The spelling of 42690913 in words is "forty-two million, six hundred ninety thousand, nine hundred thirteen".