42901561 has 2 divisors, whose sum is σ = 42901562. Its totient is φ = 42901560.

The previous prime is 42901549. The next prime is 42901567. The reversal of 42901561 is 16510924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39501225 + 3400336 = 6285^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 42901561 - 2²¹ = 40804409 is a prime.

It is not a weakly prime, because it can be changed into another prime (42901567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21450780 + 21450781.

It is an arithmetic number, because the mean of its divisors is an integer number (21450781).

Almost surely, 2^42901561 is an apocalyptic number.

It is an amenable number.

42901561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42901561 is an equidigital number, since it uses as much as digits as its factorization.

42901561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 42901561 is about 6549.9283202185. The cubic root of 42901561 is about 350.0722599103.

The spelling of 42901561 in words is "forty-two million, nine hundred one thousand, five hundred sixty-one".