245266921 has 3 divisors (see below), whose sum is σ = 245282583. Its totient is φ = 245251260.

The previous prime is 245266919. The next prime is 245266943. The reversal of 245266921 is 129662542.

The square root of 245266921 is 15661.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 243016921 + 2250000 = 15589^2 + 1500^2 .

It is not a de Polignac number, because 245266921 - 2¹ = 245266919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245266621) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7831 + ... + 23491.

It is an arithmetic number, because the mean of its divisors is an integer number (81760861).

Almost surely, 2^245266921 is an apocalyptic number.

245266921 is the 15661-st square number.

245266921 is the 7831-st centered octagonal number.

It is an amenable number.

245266921 is a deficient number, since it is larger than the sum of its proper divisors (15662).

245266921 is an frugal number, since it uses more digits than its factorization.

245266921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31322 (or 15661 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The cubic root of 245266921 is about 625.9596317370.

The spelling of 245266921 in words is "two hundred forty-five million, two hundred sixty-six thousand, nine hundred twenty-one".