1391131 has 4 divisors (see below), whose sum is σ = 1589872. Its totient is φ = 1192392.

The previous prime is 1391129. The next prime is 1391183. The reversal of 1391131 is 1311931.

It is a happy number.

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 1391131 - 2¹ = 1391129 is a prime.

It is a super-2 number, since 2×1391131² = 3870490918322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391099 and 1391108.

It is not an unprimeable number, because it can be changed into a prime (1394131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99360 + ... + 99373.

It is an arithmetic number, because the mean of its divisors is an integer number (397468).

2^1391131 is an apocalyptic number.

1391131 is a deficient number, since it is larger than the sum of its proper divisors (198741).

1391131 is an equidigital number, since it uses as much as digits as its factorization.

1391131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198740.

The product of its digits is 81, while the sum is 19.

The square root of 1391131 is about 1179.4621655653. The cubic root of 1391131 is about 111.6321637915.

The spelling of 1391131 in words is "one million, three hundred ninety-one thousand, one hundred thirty-one".