42561651 has 8 divisors (see below), whose sum is σ = 61907904. Its totient is φ = 25794920.

The previous prime is 42561643. The next prime is 42561671. The reversal of 42561651 is 15616524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42561651 - 2³ = 42561643 is a prime.

It is a super-2 number, since 2×42561651² = 3622988271691602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42561611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644841 + ... + 644906.

It is an arithmetic number, because the mean of its divisors is an integer number (7738488).

Almost surely, 2^42561651 is an apocalyptic number.

42561651 is a deficient number, since it is larger than the sum of its proper divisors (19346253).

42561651 is a wasteful number, since it uses less digits than its factorization.

42561651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289761.

The product of its digits is 7200, while the sum is 30.

The square root of 42561651 is about 6523.9291075241. The cubic root of 42561651 is about 349.1452640058.

The spelling of 42561651 in words is "forty-two million, five hundred sixty-one thousand, six hundred fifty-one".