1157684861 has 2 divisors, whose sum is σ = 1157684862. Its totient is φ = 1157684860.

The previous prime is 1157684771. The next prime is 1157684909. The reversal of 1157684861 is 1684867511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1137712900 + 19971961 = 33730^2 + 4469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157684861 - 2²² = 1153490557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157684161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578842430 + 578842431.

It is an arithmetic number, because the mean of its divisors is an integer number (578842431).

Almost surely, 2^1157684861 is an apocalyptic number.

It is an amenable number.

1157684861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157684861 is an equidigital number, since it uses as much as digits as its factorization.

1157684861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 47.

The square root of 1157684861 is about 34024.7683460152. The cubic root of 1157684861 is about 1050.0180982519.

The spelling of 1157684861 in words is "one billion, one hundred fifty-seven million, six hundred eighty-four thousand, eight hundred sixty-one".