1300991 has 4 divisors (see below), whose sum is σ = 1325592. Its totient is φ = 1276392.

The previous prime is 1300979. The next prime is 1300997. The reversal of 1300991 is 1990031.

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 1300991 - 2⁶ = 1300927 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 (1300997) 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, 12221 + ... + 12326.

It is an arithmetic number, because the mean of its divisors is an integer number (331398).

2^1300991 is an apocalyptic number.

1300991 is a deficient number, since it is larger than the sum of its proper divisors (24601).

1300991 is an equidigital number, since it uses as much as digits as its factorization.

1300991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24600.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1300991 is about 1140.6099245579. The cubic root of 1300991 is about 109.1670138352.

The spelling of 1300991 in words is "one million, three hundred thousand, nine hundred ninety-one".