42291891 has 24 divisors (see below), whose sum is σ = 64922000. Its totient is φ = 26453952.

The previous prime is 42291863. The next prime is 42291923. The reversal of 42291891 is 19819224.

It is not a de Polignac number, because 42291891 - 2¹⁷ = 42160819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42291811) 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, 17505 + ... + 19773.

Almost surely, 2^42291891 is an apocalyptic number.

42291891 is a deficient number, since it is larger than the sum of its proper divisors (22630109).

42291891 is a wasteful number, since it uses less digits than its factorization.

42291891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403 (or 2400 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 42291891 is about 6503.2215862602. The cubic root of 42291891 is about 348.4060608861.

The spelling of 42291891 in words is "forty-two million, two hundred ninety-one thousand, eight hundred ninety-one".