81895954 has 12 divisors (see below), whose sum is σ = 142900254. Its totient is φ = 35098224.

The previous prime is 81895943. The next prime is 81895963. The reversal of 81895954 is 45959818.

It can be written as a sum of positive squares in only one way, i.e., 77915929 + 3980025 = 8827^2 + 1995^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 81895898 and 81895907.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 417739 + ... + 417934.

Almost surely, 2^81895954 is an apocalyptic number.

81895954 is a deficient number, since it is larger than the sum of its proper divisors (61004300).

81895954 is a wasteful number, since it uses less digits than its factorization.

81895954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835689 (or 835682 counting only the distinct ones).

The product of its digits is 518400, while the sum is 49.

The square root of 81895954 is about 9049.6383353148. The cubic root of 81895954 is about 434.2643204303.

The spelling of 81895954 in words is "eighty-one million, eight hundred ninety-five thousand, nine hundred fifty-four".