81619095 has 16 divisors (see below), whose sum is σ = 130728672. Its totient is φ = 43484160.

The previous prime is 81619081. The next prime is 81619103. The reversal of 81619095 is 59091618.

It is not a de Polignac number, because 81619095 - 2⁸ = 81618839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15615 + ... + 20175.

It is an arithmetic number, because the mean of its divisors is an integer number (8170542).

Almost surely, 2^81619095 is an apocalyptic number.

81619095 is a deficient number, since it is larger than the sum of its proper divisors (49109577).

81619095 is a wasteful number, since it uses less digits than its factorization.

81619095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5762.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 81619095 is about 9034.3286966991. The cubic root of 81619095 is about 433.7744072394.

The spelling of 81619095 in words is "eighty-one million, six hundred nineteen thousand, ninety-five".