244521661 has 2 divisors, whose sum is σ = 244521662. Its totient is φ = 244521660.

The previous prime is 244521653. The next prime is 244521703. The reversal of 244521661 is 166125442.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148108900 + 96412761 = 12170^2 + 9819^2 .

It is a cyclic number.

It is not a de Polignac number, because 244521661 - 2³ = 244521653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244521601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122260830 + 122260831.

It is an arithmetic number, because the mean of its divisors is an integer number (122260831).

Almost surely, 2^244521661 is an apocalyptic number.

It is an amenable number.

244521661 is a deficient number, since it is larger than the sum of its proper divisors (1).

244521661 is an equidigital number, since it uses as much as digits as its factorization.

244521661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 244521661 is about 15637.1883981744. The cubic root of 244521661 is about 625.3249817097.

The spelling of 244521661 in words is "two hundred forty-four million, five hundred twenty-one thousand, six hundred sixty-one".