1131219857 has 2 divisors, whose sum is σ = 1131219858. Its totient is φ = 1131219856.

The previous prime is 1131219841. The next prime is 1131219913. The reversal of 1131219857 is 7589121311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598487296 + 532732561 = 24464^2 + 23081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131219857 - 2⁴ = 1131219841 is a prime.

It is a super-2 number, since 2×1131219857² = 2559316729742200898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1131219857.

It is not a weakly prime, because it can be changed into another prime (1131216857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565609928 + 565609929.

It is an arithmetic number, because the mean of its divisors is an integer number (565609929).

Almost surely, 2^1131219857 is an apocalyptic number.

It is an amenable number.

1131219857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131219857 is an equidigital number, since it uses as much as digits as its factorization.

1131219857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 1131219857 is about 33633.6120123902. The cubic root of 1131219857 is about 1041.9551046389.

The spelling of 1131219857 in words is "one billion, one hundred thirty-one million, two hundred nineteen thousand, eight hundred fifty-seven".