245321551 has 4 divisors (see below), whose sum is σ = 246120952. Its totient is φ = 244522152.

The previous prime is 245321501. The next prime is 245321563. The reversal of 245321551 is 155123542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245321551 - 2⁷ = 245321423 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 (245321501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399240 + ... + 399853.

It is an arithmetic number, because the mean of its divisors is an integer number (61530238).

Almost surely, 2^245321551 is an apocalyptic number.

245321551 is a deficient number, since it is larger than the sum of its proper divisors (799401).

245321551 is an equidigital number, since it uses as much as digits as its factorization.

245321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799400.

The product of its digits is 6000, while the sum is 28.

The square root of 245321551 is about 15662.7440443876. The cubic root of 245321551 is about 626.0061030616.

The spelling of 245321551 in words is "two hundred forty-five million, three hundred twenty-one thousand, five hundred fifty-one".