42991275 has 24 divisors (see below), whose sum is σ = 72251824. Its totient is φ = 22550400.

The previous prime is 42991259. The next prime is 42991279. The reversal of 42991275 is 57219924.

It is not a de Polignac number, because 42991275 - 2⁴ = 42991259 is a prime.

It is a super-2 number, since 2×42991275² = 3696499452251250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42991279) 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, 124 + ... + 9273.

Almost surely, 2^42991275 is an apocalyptic number.

42991275 is a deficient number, since it is larger than the sum of its proper divisors (29260549).

42991275 is a wasteful number, since it uses less digits than its factorization.

42991275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471 (or 9466 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 42991275 is about 6556.7732155383. The cubic root of 42991275 is about 350.3161089722.

The spelling of 42991275 in words is "forty-two million, nine hundred ninety-one thousand, two hundred seventy-five".