1131857 has 2 divisors, whose sum is σ = 1131858. Its totient is φ = 1131856.

The previous prime is 1131839. The next prime is 1131863. The reversal of 1131857 is 7581311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 287296 = 919^2 + 536^2 .

It is an emirp because it is prime and its reverse (7581311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131857 is a prime.

It is a super-2 number, since 2×1131857² = 2562200536898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1131827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565928 + 565929.

It is an arithmetic number, because the mean of its divisors is an integer number (565929).

2^1131857 is an apocalyptic number.

It is an amenable number.

1131857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131857 is an equidigital number, since it uses as much as digits as its factorization.

1131857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 26.

The square root of 1131857 is about 1063.8876820417. The cubic root of 1131857 is about 104.2150689902.

The spelling of 1131857 in words is "one million, one hundred thirty-one thousand, eight hundred fifty-seven".