8391157 has 4 divisors (see below), whose sum is σ = 8533440. Its totient is φ = 8248876.

The previous prime is 8391151. The next prime is 8391197. The reversal of 8391157 is 7511938.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8391157 - 2²³ = 2549 is a prime.

It is a super-3 number, since 3×8391157³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8391151) 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, 71053 + ... + 71170.

It is an arithmetic number, because the mean of its divisors is an integer number (2133360).

Almost surely, 2^8391157 is an apocalyptic number.

It is an amenable number.

8391157 is a deficient number, since it is larger than the sum of its proper divisors (142283).

8391157 is a wasteful number, since it uses less digits than its factorization.

8391157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142282.

The product of its digits is 7560, while the sum is 34.

The square root of 8391157 is about 2896.7493850867. The cubic root of 8391157 is about 203.2079130389.

The spelling of 8391157 in words is "eight million, three hundred ninety-one thousand, one hundred fifty-seven".