245009881 has 4 divisors (see below), whose sum is σ = 245082064. Its totient is φ = 244937700.

The previous prime is 245009837. The next prime is 245009903. The reversal of 245009881 is 188900542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245009881 is a prime.

It is a super-2 number, since 2×245009881² = 120059683575268322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245009881.

It is not an unprimeable number, because it can be changed into a prime (245009381) 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, 30735 + ... + 37876.

It is an arithmetic number, because the mean of its divisors is an integer number (61270516).

Almost surely, 2^245009881 is an apocalyptic number.

It is an amenable number.

245009881 is a deficient number, since it is larger than the sum of its proper divisors (72183).

245009881 is an equidigital number, since it uses as much as digits as its factorization.

245009881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72182.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 245009881 is about 15652.7914762831. The cubic root of 245009881 is about 625.7408865124.

The spelling of 245009881 in words is "two hundred forty-five million, nine thousand, eight hundred eighty-one".