42491961 has 24 divisors (see below), whose sum is σ = 64995840. Its totient is φ = 26676000.

The previous prime is 42491927. The next prime is 42492019. The reversal of 42491961 is 16919424.

It is a happy number.

It is not a de Polignac number, because 42491961 - 2²³ = 34103353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42491921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32011 + ... + 33311.

It is an arithmetic number, because the mean of its divisors is an integer number (2708160).

Almost surely, 2^42491961 is an apocalyptic number.

It is an amenable number.

42491961 is a deficient number, since it is larger than the sum of its proper divisors (22503879).

42491961 is a wasteful number, since it uses less digits than its factorization.

42491961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1514 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 42491961 is about 6518.5858128892. The cubic root of 42491961 is about 348.9545976411.

The spelling of 42491961 in words is "forty-two million, four hundred ninety-one thousand, nine hundred sixty-one".