116891557 has 2 divisors, whose sum is σ = 116891558. Its totient is φ = 116891556.

The previous prime is 116891503. The next prime is 116891563. The reversal of 116891557 is 755198611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103245921 + 13645636 = 10161^2 + 3694^2 .

It is a cyclic number.

It is not a de Polignac number, because 116891557 - 2¹⁵ = 116858789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116892557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58445778 + 58445779.

It is an arithmetic number, because the mean of its divisors is an integer number (58445779).

Almost surely, 2^116891557 is an apocalyptic number.

It is an amenable number.

116891557 is a deficient number, since it is larger than the sum of its proper divisors (1).

116891557 is an equidigital number, since it uses as much as digits as its factorization.

116891557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 43.

The square root of 116891557 is about 10811.6398848648. The cubic root of 116891557 is about 488.9461691628.

The spelling of 116891557 in words is "one hundred sixteen million, eight hundred ninety-one thousand, five hundred fifty-seven".