81254916 has 36 divisors (see below), whose sum is σ = 209768832. Its totient is φ = 26508144.

The previous prime is 81254893. The next prime is 81254939. The reversal of 81254916 is 61945218.

It is an interprime number because it is at equal distance from previous prime (81254893) and next prime (81254939).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×81254916² = 13204722748334112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22320 + ... + 25703.

It is an arithmetic number, because the mean of its divisors is an integer number (5826912).

Almost surely, 2^81254916 is an apocalyptic number.

It is an amenable number.

81254916 is an abundant number, since it is smaller than the sum of its proper divisors (128513916).

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

81254916 is a wasteful number, since it uses less digits than its factorization.

81254916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48080 (or 48075 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81254916 is about 9014.1508751518. The cubic root of 81254916 is about 433.1282877383.

It can be divided in two parts, 8125 and 4916, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 81254916 in words is "eighty-one million, two hundred fifty-four thousand, nine hundred sixteen".