309698641 has 4 divisors (see below), whose sum is σ = 353941312. Its totient is φ = 265455972.

The previous prime is 309698629. The next prime is 309698681. The reversal of 309698641 is 146896903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309698641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 309698591 and 309698600.

It is not an unprimeable number, because it can be changed into a prime (309698681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22121325 + ... + 22121338.

It is an arithmetic number, because the mean of its divisors is an integer number (88485328).

Almost surely, 2^309698641 is an apocalyptic number.

It is an amenable number.

309698641 is a deficient number, since it is larger than the sum of its proper divisors (44242671).

309698641 is an equidigital number, since it uses as much as digits as its factorization.

309698641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44242670.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 309698641 is about 17598.2567602590. The cubic root of 309698641 is about 676.5705657834.

The spelling of 309698641 in words is "three hundred nine million, six hundred ninety-eight thousand, six hundred forty-one".