42651569 has 2 divisors, whose sum is σ = 42651570. Its totient is φ = 42651568.

The previous prime is 42651551. The next prime is 42651613. The reversal of 42651569 is 96515624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33500944 + 9150625 = 5788^2 + 3025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42651569 is a prime.

It is a super-2 number, since 2×42651569² = 3638312676323522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42651509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21325784 + 21325785.

It is an arithmetic number, because the mean of its divisors is an integer number (21325785).

Almost surely, 2^42651569 is an apocalyptic number.

It is an amenable number.

42651569 is a deficient number, since it is larger than the sum of its proper divisors (1).

42651569 is an equidigital number, since it uses as much as digits as its factorization.

42651569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 42651569 is about 6530.8168708057. The cubic root of 42651569 is about 349.3909653238.

The spelling of 42651569 in words is "forty-two million, six hundred fifty-one thousand, five hundred sixty-nine".