81914999 has 2 divisors, whose sum is σ = 81915000. Its totient is φ = 81914998.

The previous prime is 81914971. The next prime is 81915011. The reversal of 81914999 is 99941918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81914999 - 2¹² = 81910903 is a prime.

It is a super-2 number, since 2×81914999² = 13420134122340002, 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 (81914099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40957499 + 40957500.

It is an arithmetic number, because the mean of its divisors is an integer number (40957500).

Almost surely, 2^81914999 is an apocalyptic number.

81914999 is a deficient number, since it is larger than the sum of its proper divisors (1).

81914999 is an equidigital number, since it uses as much as digits as its factorization.

81914999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 50.

The square root of 81914999 is about 9050.6905261422. The cubic root of 81914999 is about 434.2979807133.

The spelling of 81914999 in words is "eighty-one million, nine hundred fourteen thousand, nine hundred ninety-nine".