99138251 has 2 divisors, whose sum is σ = 99138252. Its totient is φ = 99138250.

The previous prime is 99138233. The next prime is 99138293. The reversal of 99138251 is 15283199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99138251 - 2⁶ = 99138187 is a prime.

It is a super-2 number, since 2×99138251² = 19656785622678002, which contains 22 as substring.

It is a Chen prime.

It is equal to p_5714687 and since 99138251 and 5714687 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (99132251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49569125 + 49569126.

It is an arithmetic number, because the mean of its divisors is an integer number (49569126).

Almost surely, 2^99138251 is an apocalyptic number.

99138251 is a deficient number, since it is larger than the sum of its proper divisors (1).

99138251 is an equidigital number, since it uses as much as digits as its factorization.

99138251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 38.

The square root of 99138251 is about 9956.8193214500. The cubic root of 99138251 is about 462.8217401895.

The spelling of 99138251 in words is "ninety-nine million, one hundred thirty-eight thousand, two hundred fifty-one".