245491 has 4 divisors (see below), whose sum is σ = 247552. Its totient is φ = 243432.

The previous prime is 245477. The next prime is 245501. The reversal of 245491 is 194542.

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 245491 - 2¹⁷ = 114419 is a prime.

It is a deceptive number, since it divides R₂₄₅₄₉₀.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245411) 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, 840 + ... + 1093.

It is an arithmetic number, because the mean of its divisors is an integer number (61888).

2²⁴⁵⁴⁹¹ is an apocalyptic number.

245491 is a deficient number, since it is larger than the sum of its proper divisors (2061).

245491 is a wasteful number, since it uses less digits than its factorization.

245491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060.

The product of its digits is 1440, while the sum is 25.

The square root of 245491 is about 495.4704834801. The cubic root of 245491 is about 62.6150201958.

It can be divided in two parts, 245 and 491, that multiplied together give a triangular number (120295 = T₄₉₀).

The spelling of 245491 in words is "two hundred forty-five thousand, four hundred ninety-one".