1391099 has 4 divisors (see below), whose sum is σ = 1393560. Its totient is φ = 1388640.

The previous prime is 1391087. The next prime is 1391113. The reversal of 1391099 is 9901931.

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 1391099 - 2⁴ = 1391083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391029) 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, 92 + ... + 1670.

It is an arithmetic number, because the mean of its divisors is an integer number (348390).

2^1391099 is an apocalyptic number.

1391099 is a deficient number, since it is larger than the sum of its proper divisors (2461).

1391099 is an equidigital number, since it uses as much as digits as its factorization.

1391099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1391099 is about 1179.4485999822. The cubic root of 1391099 is about 111.6313078317.

The spelling of 1391099 in words is "one million, three hundred ninety-one thousand, ninety-nine".