42993081 has 6 divisors (see below), whose sum is σ = 62101130. Its totient is φ = 28662048.

The previous prime is 42993079. The next prime is 42993089. The reversal of 42993081 is 18039924.

It can be written as a sum of positive squares in only one way, i.e., 37015056 + 5978025 = 6084^2 + 2445^2 .

It is not a de Polignac number, because 42993081 - 2¹ = 42993079 is a prime.

It is a super-2 number, since 2×42993081² = 3696810027745122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42993089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2388496 + ... + 2388513.

Almost surely, 2^42993081 is an apocalyptic number.

It is an amenable number.

42993081 is a deficient number, since it is larger than the sum of its proper divisors (19108049).

42993081 is a wasteful number, since it uses less digits than its factorization.

42993081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4777015 (or 4777012 counting only the distinct ones).

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

The square root of 42993081 is about 6556.9109342739. The cubic root of 42993081 is about 350.3210143244.

The spelling of 42993081 in words is "forty-two million, nine hundred ninety-three thousand, eighty-one".