245091 has 16 divisors (see below), whose sum is σ = 407808. Its totient is φ = 127200.

The previous prime is 245087. The next prime is 245107. The reversal of 245091 is 190542.

It is not a de Polignac number, because 245091 - 2² = 245087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

245091 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (245071) 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, 300 + ... + 761.

It is an arithmetic number, because the mean of its divisors is an integer number (25488).

2²⁴⁵⁰⁹¹ is an apocalyptic number.

245091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

245091 is a deficient number, since it is larger than the sum of its proper divisors (162717).

245091 is a wasteful number, since it uses less digits than its factorization.

245091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 245091 is about 495.0666621779. The cubic root of 245091 is about 62.5809936618.

It can be divided in two parts, 24 and 5091, that added together give a palindrome (5115).

The spelling of 245091 in words is "two hundred forty-five thousand, ninety-one".