81279154 has 16 divisors (see below), whose sum is σ = 134297280. Its totient is φ = 36585360.

The previous prime is 81279151. The next prime is 81279173. The reversal of 81279154 is 45197218.

It is not an unprimeable number, because it can be changed into a prime (81279151) 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, 15669 + ... + 20200.

It is an arithmetic number, because the mean of its divisors is an integer number (8393580).

Almost surely, 2^81279154 is an apocalyptic number.

81279154 is a deficient number, since it is larger than the sum of its proper divisors (53018126).

81279154 is a wasteful number, since it uses less digits than its factorization.

81279154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35985.

The product of its digits is 20160, while the sum is 37.

The square root of 81279154 is about 9015.4952165702. The cubic root of 81279154 is about 433.1713502395.

The spelling of 81279154 in words is "eighty-one million, two hundred seventy-nine thousand, one hundred fifty-four".