42651517 has 2 divisors, whose sum is σ = 42651518. Its totient is φ = 42651516.

The previous prime is 42651509. The next prime is 42651527. The reversal of 42651517 is 71515624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35176761 + 7474756 = 5931^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 42651517 - 2³ = 42651509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42651527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21325758 + 21325759.

It is an arithmetic number, because the mean of its divisors is an integer number (21325759).

Almost surely, 2^42651517 is an apocalyptic number.

It is an amenable number.

42651517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42651517 is an equidigital number, since it uses as much as digits as its factorization.

42651517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 42651517 is about 6530.8128896792. The cubic root of 42651517 is about 349.3908233334.

The spelling of 42651517 in words is "forty-two million, six hundred fifty-one thousand, five hundred seventeen".