1087891517 has 2 divisors, whose sum is σ = 1087891518. Its totient is φ = 1087891516.

The previous prime is 1087891487. The next prime is 1087891543. The reversal of 1087891517 is 7151987801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087284676 + 606841 = 32974^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087891517 - 2¹² = 1087887421 is a prime.

It is a super-2 number, since 2×1087891517² = 2367015905521122578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087891117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543945758 + 543945759.

It is an arithmetic number, because the mean of its divisors is an integer number (543945759).

Almost surely, 2^1087891517 is an apocalyptic number.

It is an amenable number.

1087891517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087891517 is an equidigital number, since it uses as much as digits as its factorization.

1087891517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 47.

The square root of 1087891517 is about 32983.2005269349. The cubic root of 1087891517 is about 1028.4784512618.

The spelling of 1087891517 in words is "one billion, eighty-seven million, eight hundred ninety-one thousand, five hundred seventeen".