245329621 has 2 divisors, whose sum is σ = 245329622. Its totient is φ = 245329620.

The previous prime is 245329619. The next prime is 245329631. The reversal of 245329621 is 126923542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208484721 + 36844900 = 14439^2 + 6070^2 .

It is a cyclic number.

It is not a de Polignac number, because 245329621 - 2¹ = 245329619 is a prime.

Together with 245329619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245329631) 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 as a sum of consecutive naturals, namely, 122664810 + 122664811.

It is an arithmetic number, because the mean of its divisors is an integer number (122664811).

Almost surely, 2^245329621 is an apocalyptic number.

It is an amenable number.

245329621 is a deficient number, since it is larger than the sum of its proper divisors (1).

245329621 is an equidigital number, since it uses as much as digits as its factorization.

245329621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 245329621 is about 15663.0016599629. The cubic root of 245329621 is about 626.0129672687.

The spelling of 245329621 in words is "two hundred forty-five million, three hundred twenty-nine thousand, six hundred twenty-one".