99729631 has 2 divisors, whose sum is σ = 99729632. Its totient is φ = 99729630.

The previous prime is 99729593. The next prime is 99729649. The reversal of 99729631 is 13692799.

It is a strong prime.

It is an emirp because it is prime and its reverse (13692799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99729631 - 2⁷ = 99729503 is a prime.

It is a super-2 number, since 2×99729631² = 19891998598792322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99729691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49864815 + 49864816.

It is an arithmetic number, because the mean of its divisors is an integer number (49864816).

Almost surely, 2^99729631 is an apocalyptic number.

99729631 is a deficient number, since it is larger than the sum of its proper divisors (1).

99729631 is an equidigital number, since it uses as much as digits as its factorization.

99729631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 99729631 is about 9986.4724002022. The cubic root of 99729631 is about 463.7401918865.

It can be divided in two parts, 9972963 and 1, that added together give a square (9972964 = 3158²).

The spelling of 99729631 in words is "ninety-nine million, seven hundred twenty-nine thousand, six hundred thirty-one".