309091397140 has 12 divisors (see below), whose sum is σ = 649091934036. Its totient is φ = 123636558848.

The previous prime is 309091397123. The next prime is 309091397201. The reversal of 309091397140 is 41793190903.

It can be written as a sum of positive squares in 2 ways, for example, as 89049721744 + 220041675396 = 298412^2 + 469086^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7727284909 + ... + 7727284948.

It is an arithmetic number, because the mean of its divisors is an integer number (54090994503).

Almost surely, 2^309091397140 is an apocalyptic number.

It is an amenable number.

309091397140 is an abundant number, since it is smaller than the sum of its proper divisors (340000536896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309091397140 is a wasteful number, since it uses less digits than its factorization.

309091397140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15454569866 (or 15454569864 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 46.

The spelling of 309091397140 in words is "three hundred nine billion, ninety-one million, three hundred ninety-seven thousand, one hundred forty".