42489961 has 4 divisors (see below), whose sum is σ = 42538752. Its totient is φ = 42441172.

The previous prime is 42489943. The next prime is 42489983. The reversal of 42489961 is 16998424.

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 42489961 - 2⁵ = 42489929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42489911) 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, 23065 + ... + 24838.

It is an arithmetic number, because the mean of its divisors is an integer number (10634688).

Almost surely, 2^42489961 is an apocalyptic number.

It is an amenable number.

42489961 is a deficient number, since it is larger than the sum of its proper divisors (48791).

42489961 is an equidigital number, since it uses as much as digits as its factorization.

42489961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48790.

The product of its digits is 124416, while the sum is 43.

The square root of 42489961 is about 6518.4324035768. The cubic root of 42489961 is about 348.9491227220.

The spelling of 42489961 in words is "forty-two million, four hundred eighty-nine thousand, nine hundred sixty-one".