42690517 has 2 divisors, whose sum is σ = 42690518. Its totient is φ = 42690516.

The previous prime is 42690509. The next prime is 42690521. The reversal of 42690517 is 71509624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38825361 + 3865156 = 6231^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 42690517 - 2³ = 42690509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42690547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21345258 + 21345259.

It is an arithmetic number, because the mean of its divisors is an integer number (21345259).

Almost surely, 2^42690517 is an apocalyptic number.

It is an amenable number.

42690517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42690517 is an equidigital number, since it uses as much as digits as its factorization.

42690517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 42690517 is about 6533.7980532000. The cubic root of 42690517 is about 349.4972837203.

The spelling of 42690517 in words is "forty-two million, six hundred ninety thousand, five hundred seventeen".