1087155917 has 2 divisors, whose sum is σ = 1087155918. Its totient is φ = 1087155916.

The previous prime is 1087155913. The next prime is 1087155961. The reversal of 1087155917 is 7195517801.

It is an a-pointer prime, because the next prime (1087155961) can be obtained adding 1087155917 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1004509636 + 82646281 = 31694^2 + 9091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087155917 - 2² = 1087155913 is a prime.

It is a super-2 number, since 2×1087155917² = 2363815975736221778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087155913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543577958 + 543577959.

It is an arithmetic number, because the mean of its divisors is an integer number (543577959).

Almost surely, 2^1087155917 is an apocalyptic number.

It is an amenable number.

1087155917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087155917 is an equidigital number, since it uses as much as digits as its factorization.

1087155917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 44.

The square root of 1087155917 is about 32972.0475099743. The cubic root of 1087155917 is about 1028.2465901128.

The spelling of 1087155917 in words is "one billion, eighty-seven million, one hundred fifty-five thousand, nine hundred seventeen".