42917561 has 4 divisors (see below), whose sum is σ = 45176400. Its totient is φ = 40658724.

The previous prime is 42917543. The next prime is 42917573. The reversal of 42917561 is 16571924.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42917561 - 2²² = 38723257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42917591) 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, 1129391 + ... + 1129428.

It is an arithmetic number, because the mean of its divisors is an integer number (11294100).

Almost surely, 2^42917561 is an apocalyptic number.

It is an amenable number.

42917561 is a deficient number, since it is larger than the sum of its proper divisors (2258839).

42917561 is a wasteful number, since it uses less digits than its factorization.

42917561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258838.

The product of its digits is 15120, while the sum is 35.

The square root of 42917561 is about 6551.1495937736. The cubic root of 42917561 is about 350.1157739447.

The spelling of 42917561 in words is "forty-two million, nine hundred seventeen thousand, five hundred sixty-one".