1309401871 has 4 divisors (see below), whose sum is σ = 1341338544. Its totient is φ = 1277465200.

The previous prime is 1309401869. The next prime is 1309401883. The reversal of 1309401871 is 1781049031.

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 1309401871 - 2¹ = 1309401869 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 (1309401371) 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, 15968275 + ... + 15968356.

It is an arithmetic number, because the mean of its divisors is an integer number (335334636).

Almost surely, 2^1309401871 is an apocalyptic number.

1309401871 is a deficient number, since it is larger than the sum of its proper divisors (31936673).

1309401871 is an equidigital number, since it uses as much as digits as its factorization.

1309401871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31936672.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1309401871 is about 36185.6583607373. The cubic root of 1309401871 is about 1094.0176259126.

The spelling of 1309401871 in words is "one billion, three hundred nine million, four hundred one thousand, eight hundred seventy-one".