42015317 has 4 divisors (see below), whose sum is σ = 42199020. Its totient is φ = 41831616.

The previous prime is 42015307. The next prime is 42015329. The reversal of 42015317 is 71351024.

42015317 = 44² + 45² + ... + 501².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40780996 + 1234321 = 6386^2 + 1111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42015317 is a prime.

It is a super-2 number, since 2×42015317² = 3530573725220978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42015292 and 42015301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42015307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91508 + ... + 91965.

It is an arithmetic number, because the mean of its divisors is an integer number (10549755).

Almost surely, 2^42015317 is an apocalyptic number.

It is an amenable number.

42015317 is a deficient number, since it is larger than the sum of its proper divisors (183703).

42015317 is a wasteful number, since it uses less digits than its factorization.

42015317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183702.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 42015317 is about 6481.9223228916. The cubic root of 42015317 is about 347.6449151467.

The spelling of 42015317 in words is "forty-two million, fifteen thousand, three hundred seventeen".