245104721 has 4 divisors (see below), whose sum is σ = 255761472. Its totient is φ = 234447972.

The previous prime is 245104697. The next prime is 245104733. The reversal of 245104721 is 127401542.

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-245104721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245104751) 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, 5328341 + ... + 5328386.

It is an arithmetic number, because the mean of its divisors is an integer number (63940368).

Almost surely, 2^245104721 is an apocalyptic number.

It is an amenable number.

245104721 is a deficient number, since it is larger than the sum of its proper divisors (10656751).

245104721 is a wasteful number, since it uses less digits than its factorization.

245104721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656750.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 245104721 is about 15655.8206747523. The cubic root of 245104721 is about 625.8216146989.

The spelling of 245104721 in words is "two hundred forty-five million, one hundred four thousand, seven hundred twenty-one".