1309444331 has 4 divisors (see below), whose sum is σ = 1410170832. Its totient is φ = 1208717832.

The previous prime is 1309444327. The next prime is 1309444369. The reversal of 1309444331 is 1334449031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1309444331 - 2² = 1309444327 is a prime.

It is a super-2 number, since 2×1309444331² = 3429288911976075122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309444391) 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, 50363231 + ... + 50363256.

It is an arithmetic number, because the mean of its divisors is an integer number (352542708).

Almost surely, 2^1309444331 is an apocalyptic number.

1309444331 is a deficient number, since it is larger than the sum of its proper divisors (100726501).

1309444331 is a wasteful number, since it uses less digits than its factorization.

1309444331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100726500.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1309444331 is about 36186.2450525058. The cubic root of 1309444331 is about 1094.0294510285.

The spelling of 1309444331 in words is "one billion, three hundred nine million, four hundred forty-four thousand, three hundred thirty-one".