81519654 has 16 divisors (see below), whose sum is σ = 163222848. Its totient is φ = 27142632.

The previous prime is 81519653. The next prime is 81519661. The reversal of 81519654 is 45691518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81519653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1492 + ... + 12855.

It is an arithmetic number, because the mean of its divisors is an integer number (10201428).

Almost surely, 2^81519654 is an apocalyptic number.

81519654 is an abundant number, since it is smaller than the sum of its proper divisors (81703194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81519654 is a wasteful number, since it uses less digits than its factorization.

81519654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15299.

The product of its digits is 43200, while the sum is 39.

The square root of 81519654 is about 9028.8235113995. The cubic root of 81519654 is about 433.5981719659.

The spelling of 81519654 in words is "eighty-one million, five hundred nineteen thousand, six hundred fifty-four".