1391151 has 4 divisors (see below), whose sum is σ = 1854872. Its totient is φ = 927432.

The previous prime is 1391129. The next prime is 1391183. The reversal of 1391151 is 1511931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1391151 - 2⁵ = 1391119 is a prime.

It is a super-2 number, since 2×1391151² = 3870602209602, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391051) 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, 231856 + ... + 231861.

It is an arithmetic number, because the mean of its divisors is an integer number (463718).

2^1391151 is an apocalyptic number.

1391151 is a deficient number, since it is larger than the sum of its proper divisors (463721).

1391151 is an equidigital number, since it uses as much as digits as its factorization.

1391151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463720.

The product of its digits is 135, while the sum is 21.

The square root of 1391151 is about 1179.4706439755. The cubic root of 1391151 is about 111.6326987597.

The spelling of 1391151 in words is "one million, three hundred ninety-one thousand, one hundred fifty-one".