1172681557 has 2 divisors, whose sum is σ = 1172681558. Its totient is φ = 1172681556.

The previous prime is 1172681527. The next prime is 1172681567. The reversal of 1172681557 is 7551862711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688065361 + 484616196 = 26231^2 + 22014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1172681557 - 2⁷ = 1172681429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1172681527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586340778 + 586340779.

It is an arithmetic number, because the mean of its divisors is an integer number (586340779).

Almost surely, 2^1172681557 is an apocalyptic number.

It is an amenable number.

1172681557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1172681557 is an equidigital number, since it uses as much as digits as its factorization.

1172681557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 43.

The square root of 1172681557 is about 34244.4383367577. The cubic root of 1172681557 is about 1054.5326522531.

The spelling of 1172681557 in words is "one billion, one hundred seventy-two million, six hundred eighty-one thousand, five hundred fifty-seven".