245711621 has 4 divisors (see below), whose sum is σ = 246212544. Its totient is φ = 245210700.

The previous prime is 245711593. The next prime is 245711633. The reversal of 245711621 is 126117542.

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-245711621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245711671) 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, 249725 + ... + 250706.

It is an arithmetic number, because the mean of its divisors is an integer number (61553136).

Almost surely, 2^245711621 is an apocalyptic number.

It is an amenable number.

245711621 is a deficient number, since it is larger than the sum of its proper divisors (500923).

245711621 is an equidigital number, since it uses as much as digits as its factorization.

245711621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500922.

The product of its digits is 3360, while the sum is 29.

The square root of 245711621 is about 15675.1912588013. The cubic root of 245711621 is about 626.3377180274.

The spelling of 245711621 in words is "two hundred forty-five million, seven hundred eleven thousand, six hundred twenty-one".