42990851 has 2 divisors, whose sum is σ = 42990852. Its totient is φ = 42990850.

The previous prime is 42990833. The next prime is 42990859. The reversal of 42990851 is 15809924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42990851 - 2¹⁰ = 42989827 is a prime.

It is not a weakly prime, because it can be changed into another prime (42990859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21495425 + 21495426.

It is an arithmetic number, because the mean of its divisors is an integer number (21495426).

Almost surely, 2^42990851 is an apocalyptic number.

42990851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42990851 is an equidigital number, since it uses as much as digits as its factorization.

42990851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 42990851 is about 6556.7408824812. The cubic root of 42990851 is about 350.3149573082.

The spelling of 42990851 in words is "forty-two million, nine hundred ninety thousand, eight hundred fifty-one".