81154442 has 8 divisors (see below), whose sum is σ = 127024416. Its totient is φ = 38812972.

The previous prime is 81154439. The next prime is 81154519. The reversal of 81154442 is 24445118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 882068 + ... + 882159.

It is an arithmetic number, because the mean of its divisors is an integer number (15878052).

Almost surely, 2^81154442 is an apocalyptic number.

81154442 is a deficient number, since it is larger than the sum of its proper divisors (45869974).

81154442 is a wasteful number, since it uses less digits than its factorization.

81154442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764252.

The product of its digits is 5120, while the sum is 29.

The square root of 81154442 is about 9008.5760250996. The cubic root of 81154442 is about 432.9496889810.

The spelling of 81154442 in words is "eighty-one million, one hundred fifty-four thousand, four hundred forty-two".