99981653 has 2 divisors, whose sum is σ = 99981654. Its totient is φ = 99981652.

The previous prime is 99981649. The next prime is 99981697. The reversal of 99981653 is 35618999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87179569 + 12802084 = 9337^2 + 3578^2 .

It is a cyclic number.

It is not a de Polignac number, because 99981653 - 2² = 99981649 is a prime.

It is a super-2 number, since 2×99981653² = 19992661873224818, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99981613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49990826 + 49990827.

It is an arithmetic number, because the mean of its divisors is an integer number (49990827).

Almost surely, 2^99981653 is an apocalyptic number.

It is an amenable number.

99981653 is a deficient number, since it is larger than the sum of its proper divisors (1).

99981653 is an equidigital number, since it uses as much as digits as its factorization.

99981653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 99981653 is about 9999.0826079196. The cubic root of 99981653 is about 464.1304952150.

The spelling of 99981653 in words is "ninety-nine million, nine hundred eighty-one thousand, six hundred fifty-three".