42997591 has 16 divisors (see below), whose sum is σ = 53524800. Its totient is φ = 33631488.

The previous prime is 42997583. The next prime is 42997601. The reversal of 42997591 is 19579924.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42997591 - 2³ = 42997583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42997531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5445 + ... + 10753.

It is an arithmetic number, because the mean of its divisors is an integer number (3345300).

Almost surely, 2^42997591 is an apocalyptic number.

42997591 is a deficient number, since it is larger than the sum of its proper divisors (10527209).

42997591 is a wasteful number, since it uses less digits than its factorization.

42997591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418.

The product of its digits is 204120, while the sum is 46.

The square root of 42997591 is about 6557.2548372013. The cubic root of 42997591 is about 350.3332635243. Note that the first 3 decimals are identical.

The spelling of 42997591 in words is "forty-two million, nine hundred ninety-seven thousand, five hundred ninety-one".