42961881 has 4 divisors (see below), whose sum is σ = 57282512. Its totient is φ = 28641252.

The previous prime is 42961871. The next prime is 42961883. The reversal of 42961881 is 18816924.

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 not a de Polignac number, because 42961881 - 2⁶ = 42961817 is a prime.

It is a super-2 number, since 2×42961881² = 3691446438116322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42961883) 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, 7160311 + ... + 7160316.

It is an arithmetic number, because the mean of its divisors is an integer number (14320628).

Almost surely, 2^42961881 is an apocalyptic number.

It is an amenable number.

42961881 is a deficient number, since it is larger than the sum of its proper divisors (14320631).

42961881 is a wasteful number, since it uses less digits than its factorization.

42961881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14320630.

The product of its digits is 27648, while the sum is 39.

The square root of 42961881 is about 6554.5313333602. The cubic root of 42961881 is about 350.2362513779.

The spelling of 42961881 in words is "forty-two million, nine hundred sixty-one thousand, eight hundred eighty-one".