99681511 has 2 divisors, whose sum is σ = 99681512. Its totient is φ = 99681510.

The previous prime is 99681479. The next prime is 99681529. The reversal of 99681511 is 11518699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99681511 - 2⁵ = 99681479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99681541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49840755 + 49840756.

It is an arithmetic number, because the mean of its divisors is an integer number (49840756).

Almost surely, 2^99681511 is an apocalyptic number.

99681511 is a deficient number, since it is larger than the sum of its proper divisors (1).

99681511 is an equidigital number, since it uses as much as digits as its factorization.

99681511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 40.

The square root of 99681511 is about 9984.0628503631. The cubic root of 99681511 is about 463.6655943042.

The spelling of 99681511 in words is "ninety-nine million, six hundred eighty-one thousand, five hundred eleven".