116157221 has 2 divisors, whose sum is σ = 116157222. Its totient is φ = 116157220.

The previous prime is 116157191. The next prime is 116157247. The reversal of 116157221 is 122751611.

It is an a-pointer prime, because the next prime (116157247) can be obtained adding 116157221 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111534721 + 4622500 = 10561^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 116157221 - 2²⁶ = 49048357 is a prime.

It is equal to p_6635105 and since 116157221 and 6635105 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116157281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58078610 + 58078611.

It is an arithmetic number, because the mean of its divisors is an integer number (58078611).

Almost surely, 2^116157221 is an apocalyptic number.

It is an amenable number.

116157221 is a deficient number, since it is larger than the sum of its proper divisors (1).

116157221 is an equidigital number, since it uses as much as digits as its factorization.

116157221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 26.

The square root of 116157221 is about 10777.6259445204. The cubic root of 116157221 is about 487.9201318835.

The spelling of 116157221 in words is "one hundred sixteen million, one hundred fifty-seven thousand, two hundred twenty-one".