1340100291 has 4 divisors (see below), whose sum is σ = 1786800392. Its totient is φ = 893400192.

The previous prime is 1340100287. The next prime is 1340100337. The reversal of 1340100291 is 1920010431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1920010431 = 3 ⋅640003477.

It is not a de Polignac number, because 1340100291 - 2² = 1340100287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340100491) 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, 223350046 + ... + 223350051.

It is an arithmetic number, because the mean of its divisors is an integer number (446700098).

Almost surely, 2^1340100291 is an apocalyptic number.

1340100291 is a deficient number, since it is larger than the sum of its proper divisors (446700101).

1340100291 is an equidigital number, since it uses as much as digits as its factorization.

1340100291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446700100.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1340100291 is about 36607.3802804844. The cubic root of 1340100291 is about 1102.5012752902.

The spelling of 1340100291 in words is "one billion, three hundred forty million, one hundred thousand, two hundred ninety-one".