42561511 has 2 divisors, whose sum is σ = 42561512. Its totient is φ = 42561510.

The previous prime is 42561509. The next prime is 42561517. The reversal of 42561511 is 11516524.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42561511 - 2¹ = 42561509 is a prime.

It is a super-2 number, since 2×42561511² = 3622964437206242, which contains 22 as substring.

Together with 42561509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42561517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21280755 + 21280756.

It is an arithmetic number, because the mean of its divisors is an integer number (21280756).

Almost surely, 2^42561511 is an apocalyptic number.

42561511 is a deficient number, since it is larger than the sum of its proper divisors (1).

42561511 is an equidigital number, since it uses as much as digits as its factorization.

42561511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 42561511 is about 6523.9183777849. The cubic root of 42561511 is about 349.1448811856.

The spelling of 42561511 in words is "forty-two million, five hundred sixty-one thousand, five hundred eleven".