245840591 has 4 divisors (see below), whose sum is σ = 245962392. Its totient is φ = 245718792.

The previous prime is 245840549. The next prime is 245840599. The reversal of 245840591 is 195048542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245840591 - 2⁶ = 245840527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245840599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57821 + ... + 61926.

It is an arithmetic number, because the mean of its divisors is an integer number (61490598).

Almost surely, 2^245840591 is an apocalyptic number.

245840591 is a deficient number, since it is larger than the sum of its proper divisors (121801).

245840591 is a wasteful number, since it uses less digits than its factorization.

245840591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121800.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 245840591 is about 15679.3045445262. The cubic root of 245840591 is about 626.4472836585.

The spelling of 245840591 in words is "two hundred forty-five million, eight hundred forty thousand, five hundred ninety-one".