42904861 has 2 divisors, whose sum is σ = 42904862. Its totient is φ = 42904860.

The previous prime is 42904769. The next prime is 42904909. The reversal of 42904861 is 16840924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31304025 + 11600836 = 5595^2 + 3406^2 .

It is a cyclic number.

It is not a de Polignac number, because 42904861 - 2⁷ = 42904733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42905861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452430 + 21452431.

It is an arithmetic number, because the mean of its divisors is an integer number (21452431).

Almost surely, 2^42904861 is an apocalyptic number.

It is an amenable number.

42904861 is a deficient number, since it is larger than the sum of its proper divisors (1).

42904861 is an equidigital number, since it uses as much as digits as its factorization.

42904861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 42904861 is about 6550.1802265281. The cubic root of 42904861 is about 350.0812355654.

The spelling of 42904861 in words is "forty-two million, nine hundred four thousand, eight hundred sixty-one".