1157391 has 6 divisors (see below), whose sum is σ = 1671800. Its totient is φ = 771588.

The previous prime is 1157381. The next prime is 1157393. The reversal of 1157391 is 1937511.

It is a happy number.

1157391 is a `hidden beast` number, since 1 + 1 + 573 + 91 = 666.

It is not a de Polignac number, because 1157391 - 2⁶ = 1157327 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 (1157393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64291 + ... + 64308.

2^1157391 is an apocalyptic number.

1157391 is a deficient number, since it is larger than the sum of its proper divisors (514409).

1157391 is a wasteful number, since it uses less digits than its factorization.

1157391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128605 (or 128602 counting only the distinct ones).

The product of its digits is 945, while the sum is 27.

The square root of 1157391 is about 1075.8210817789. The cubic root of 1157391 is about 104.9929246933.

It can be divided in two parts, 11573 and 91, that added together give a square (11664 = 108²).

The spelling of 1157391 in words is "one million, one hundred fifty-seven thousand, three hundred ninety-one".