97806157 has 2 divisors, whose sum is σ = 97806158. Its totient is φ = 97806156.

The previous prime is 97806113. The next prime is 97806169. The reversal of 97806157 is 75160879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63536841 + 34269316 = 7971^2 + 5854^2 .

It is an emirp because it is prime and its reverse (75160879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97806157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97806257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48903078 + 48903079.

It is an arithmetic number, because the mean of its divisors is an integer number (48903079).

Almost surely, 2^97806157 is an apocalyptic number.

It is an amenable number.

97806157 is a deficient number, since it is larger than the sum of its proper divisors (1).

97806157 is an equidigital number, since it uses as much as digits as its factorization.

97806157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 97806157 is about 9889.6995404309. The cubic root of 97806157 is about 460.7394486976.

The spelling of 97806157 in words is "ninety-seven million, eight hundred six thousand, one hundred fifty-seven".