42501409 has 2 divisors, whose sum is σ = 42501410. Its totient is φ = 42501408.

The previous prime is 42501367. The next prime is 42501421. The reversal of 42501409 is 90410524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 20223009 = 4720^2 + 4497^2 .

It is a cyclic number.

It is not a de Polignac number, because 42501409 - 2¹¹ = 42499361 is a prime.

It is not a weakly prime, because it can be changed into another prime (42501469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21250704 + 21250705.

It is an arithmetic number, because the mean of its divisors is an integer number (21250705).

Almost surely, 2^42501409 is an apocalyptic number.

It is an amenable number.

42501409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42501409 is an equidigital number, since it uses as much as digits as its factorization.

42501409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42501409 is about 6519.3104696739. The cubic root of 42501409 is about 348.9804588364.

The spelling of 42501409 in words is "forty-two million, five hundred one thousand, four hundred nine".