81950099 has 12 divisors (see below), whose sum is σ = 103996728. Its totient is φ = 63856800.

The previous prime is 81950053. The next prime is 81950101. The reversal of 81950099 is 99005918.

It is a de Polignac number, because none of the positive numbers 2^k-81950099 is a prime.

It is a super-2 number, since 2×81950099² = 13431637452219602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81950039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75482 + ... + 76559.

It is an arithmetic number, because the mean of its divisors is an integer number (8666394).

Almost surely, 2^81950099 is an apocalyptic number.

81950099 is a deficient number, since it is larger than the sum of its proper divisors (22046629).

81950099 is a wasteful number, since it uses less digits than its factorization.

81950099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152066 (or 152059 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 81950099 is about 9052.6293970316. The cubic root of 81950099 is about 434.3600030638.

The spelling of 81950099 in words is "eighty-one million, nine hundred fifty thousand, ninety-nine".