1153972817 has 2 divisors, whose sum is σ = 1153972818. Its totient is φ = 1153972816.

The previous prime is 1153972769. The next prime is 1153972871. The reversal of 1153972817 is 7182793511.

Together with next prime (1153972871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1139805121 + 14167696 = 33761^2 + 3764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153972817 - 2⁶ = 1153972753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1153972877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576986408 + 576986409.

It is an arithmetic number, because the mean of its divisors is an integer number (576986409).

Almost surely, 2^1153972817 is an apocalyptic number.

It is an amenable number.

1153972817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153972817 is an equidigital number, since it uses as much as digits as its factorization.

1153972817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 1153972817 is about 33970.1754043161. The cubic root of 1153972817 is about 1048.8946241890.

The spelling of 1153972817 in words is "one billion, one hundred fifty-three million, nine hundred seventy-two thousand, eight hundred seventeen".