42291517 has 2 divisors, whose sum is σ = 42291518. Its totient is φ = 42291516.

The previous prime is 42291497. The next prime is 42291521. The reversal of 42291517 is 71519224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 443556 = 6469^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 42291517 - 2²³ = 33902909 is a prime.

It is a super-2 number, since 2×42291517² = 3577144820322578, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42291577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21145758 + 21145759.

It is an arithmetic number, because the mean of its divisors is an integer number (21145759).

Almost surely, 2^42291517 is an apocalyptic number.

It is an amenable number.

42291517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42291517 is an equidigital number, since it uses as much as digits as its factorization.

42291517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 42291517 is about 6503.1928312176. The cubic root of 42291517 is about 348.4050338630.

The spelling of 42291517 in words is "forty-two million, two hundred ninety-one thousand, five hundred seventeen".