99187997 has 2 divisors, whose sum is σ = 99187998. Its totient is φ = 99187996.

The previous prime is 99187969. The next prime is 99188039. The reversal of 99187997 is 79978199.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98287396 + 900601 = 9914^2 + 949^2 .

It is a cyclic number.

It is not a de Polignac number, because 99187997 - 2¹⁴ = 99171613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99187097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49593998 + 49593999.

It is an arithmetic number, because the mean of its divisors is an integer number (49593999).

Almost surely, 2^99187997 is an apocalyptic number.

It is an amenable number.

99187997 is a deficient number, since it is larger than the sum of its proper divisors (1).

99187997 is an equidigital number, since it uses as much as digits as its factorization.

99187997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 59.

The square root of 99187997 is about 9959.3170950623. The cubic root of 99187997 is about 462.8991394448.

It can be divided in two parts, 991 and 87997, that added together give a palindrome (88988).

The spelling of 99187997 in words is "ninety-nine million, one hundred eighty-seven thousand, nine hundred ninety-seven".