1309862991 has 16 divisors (see below), whose sum is σ = 1755816800. Its totient is φ = 868589568.

The previous prime is 1309862969. The next prime is 1309862993. The reversal of 1309862991 is 1992689031.

It is not a de Polignac number, because 1309862991 - 2⁶ = 1309862927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1309862991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309862993) 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, 485775 + ... + 488463.

It is an arithmetic number, because the mean of its divisors is an integer number (109738550).

Almost surely, 2^1309862991 is an apocalyptic number.

1309862991 is a deficient number, since it is larger than the sum of its proper divisors (445953809).

1309862991 is a wasteful number, since it uses less digits than its factorization.

1309862991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 1309862991 is about 36192.0293849350. The cubic root of 1309862991 is about 1094.1460342116.

The spelling of 1309862991 in words is "one billion, three hundred nine million, eight hundred sixty-two thousand, nine hundred ninety-one".