81556054 has 8 divisors (see below), whose sum is σ = 124407720. Its totient is φ = 40086816.

The previous prime is 81556051. The next prime is 81556081. The reversal of 81556054 is 45065518.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81556051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345459 + ... + 345694.

It is an arithmetic number, because the mean of its divisors is an integer number (15550965).

Almost surely, 2^81556054 is an apocalyptic number.

81556054 is a deficient number, since it is larger than the sum of its proper divisors (42851666).

81556054 is a wasteful number, since it uses less digits than its factorization.

81556054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691214.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 81556054 is about 9030.8390529341. The cubic root of 81556054 is about 433.6626988383.

The spelling of 81556054 in words is "eighty-one million, five hundred fifty-six thousand, fifty-four".