309438893641 has 2 divisors, whose sum is σ = 309438893642. Its totient is φ = 309438893640.

The previous prime is 309438893591. The next prime is 309438893677. The reversal of 309438893641 is 146398834903.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308798044416 + 640849225 = 555696^2 + 25315^2 .

It is a cyclic number.

It is not a de Polignac number, because 309438893641 - 2⁹ = 309438893129 is a prime.

It is a super-2 number, since 2×309438893641² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (309438893681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154719446820 + 154719446821.

It is an arithmetic number, because the mean of its divisors is an integer number (154719446821).

Almost surely, 2^309438893641 is an apocalyptic number.

It is an amenable number.

309438893641 is a deficient number, since it is larger than the sum of its proper divisors (1).

309438893641 is an equidigital number, since it uses as much as digits as its factorization.

309438893641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 58.

The spelling of 309438893641 in words is "three hundred nine billion, four hundred thirty-eight million, eight hundred ninety-three thousand, six hundred forty-one".