42812991 has 24 divisors (see below), whose sum is σ = 67275936. Its totient is φ = 26078400.

The previous prime is 42812989. The next prime is 42812999. The reversal of 42812991 is 19921824.

It is not a de Polignac number, because 42812991 - 2¹ = 42812989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42812999) 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, 10006 + ... + 13628.

It is an arithmetic number, because the mean of its divisors is an integer number (2803164).

Almost surely, 2^42812991 is an apocalyptic number.

42812991 is a deficient number, since it is larger than the sum of its proper divisors (24462945).

42812991 is a wasteful number, since it uses less digits than its factorization.

42812991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743 (or 3740 counting only the distinct ones).

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

The square root of 42812991 is about 6543.1636843350. The cubic root of 42812991 is about 349.8311866176.

The spelling of 42812991 in words is "forty-two million, eight hundred twelve thousand, nine hundred ninety-one".