245243491 has 4 divisors (see below), whose sum is σ = 250946872. Its totient is φ = 239540112.

The previous prime is 245243483. The next prime is 245243521. The reversal of 245243491 is 194342542.

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 245243491 - 2³ = 245243483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245243441) 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, 2851626 + ... + 2851711.

It is an arithmetic number, because the mean of its divisors is an integer number (62736718).

Almost surely, 2^245243491 is an apocalyptic number.

245243491 is a deficient number, since it is larger than the sum of its proper divisors (5703381).

245243491 is an equidigital number, since it uses as much as digits as its factorization.

245243491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703380.

The product of its digits is 34560, while the sum is 34.

The square root of 245243491 is about 15660.2519456106. The cubic root of 245243491 is about 625.9396987579.

The spelling of 245243491 in words is "two hundred forty-five million, two hundred forty-three thousand, four hundred ninety-one".