1312100091 has 24 divisors (see below), whose sum is σ = 1912638000. Its totient is φ = 866737152.

The previous prime is 1312100087. The next prime is 1312100117. The reversal of 1312100091 is 1900012131.

It is not a de Polignac number, because 1312100091 - 2² = 1312100087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312100591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1161615 + ... + 1162743.

It is an arithmetic number, because the mean of its divisors is an integer number (79693250).

Almost surely, 2^1312100091 is an apocalyptic number.

1312100091 is a deficient number, since it is larger than the sum of its proper divisors (600537909).

1312100091 is a wasteful number, since it uses less digits than its factorization.

1312100091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1312100091 is about 36222.9221764341. The cubic root of 1312100091 is about 1094.7685730970.

The spelling of 1312100091 in words is "one billion, three hundred twelve million, one hundred thousand, ninety-one".