309868161 has 8 divisors (see below), whose sum is σ = 427404480. Its totient is φ = 199455312.

The previous prime is 309868159. The next prime is 309868183. The reversal of 309868161 is 161868903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 309868161 - 2¹ = 309868159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309868151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1780765 + ... + 1780938.

It is an arithmetic number, because the mean of its divisors is an integer number (53425560).

Almost surely, 2^309868161 is an apocalyptic number.

It is an amenable number.

309868161 is a deficient number, since it is larger than the sum of its proper divisors (117536319).

309868161 is a wasteful number, since it uses less digits than its factorization.

309868161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561735.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 309868161 is about 17603.0724874949. The cubic root of 309868161 is about 676.6939882627.

The spelling of 309868161 in words is "three hundred nine million, eight hundred sixty-eight thousand, one hundred sixty-one".