42147961 has 4 divisors (see below), whose sum is σ = 42400512. Its totient is φ = 41895412.

The previous prime is 42147949. The next prime is 42147977. The reversal of 42147961 is 16974124.

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 42147961 - 2⁵ = 42147929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42147361) 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, 126025 + ... + 126358.

It is an arithmetic number, because the mean of its divisors is an integer number (10600128).

Almost surely, 2^42147961 is an apocalyptic number.

It is an amenable number.

42147961 is a deficient number, since it is larger than the sum of its proper divisors (252551).

42147961 is a wasteful number, since it uses less digits than its factorization.

42147961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252550.

The product of its digits is 12096, while the sum is 34.

The square root of 42147961 is about 6492.1461012519. The cubic root of 42147961 is about 348.0103736944.

The spelling of 42147961 in words is "forty-two million, one hundred forty-seven thousand, nine hundred sixty-one".