309940991 has 16 divisors (see below), whose sum is σ = 335280384. Its totient is φ = 285456384.

The previous prime is 309940933. The next prime is 309941039. The reversal of 309940991 is 199049903.

It is not a de Polignac number, because 309940991 - 2⁶ = 309940927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309940921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169106 + ... + 170928.

It is an arithmetic number, because the mean of its divisors is an integer number (20955024).

Almost surely, 2^309940991 is an apocalyptic number.

309940991 is a deficient number, since it is larger than the sum of its proper divisors (25339393).

309940991 is a wasteful number, since it uses less digits than its factorization.

309940991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 309940991 is about 17605.1410389125. The cubic root of 309940991 is about 676.7469997998.

The spelling of 309940991 in words is "three hundred nine million, nine hundred forty thousand, nine hundred ninety-one".