81279153 has 8 divisors (see below), whose sum is σ = 120413600. Its totient is φ = 54186084.

The previous prime is 81279151. The next prime is 81279173. The reversal of 81279153 is 35197218.

It is not a de Polignac number, because 81279153 - 2¹ = 81279151 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 1505143 + ... + 1505196.

It is an arithmetic number, because the mean of its divisors is an integer number (15051700).

Almost surely, 2^81279153 is an apocalyptic number.

It is an amenable number.

81279153 is a deficient number, since it is larger than the sum of its proper divisors (39134447).

81279153 is a wasteful number, since it uses less digits than its factorization.

81279153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010348 (or 3010342 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 81279153 is about 9015.4951611101. The cubic root of 81279153 is about 433.1713484630.

It can be divided in two parts, 8 and 1279153, that added together give a square (1279161 = 1131²).

The spelling of 81279153 in words is "eighty-one million, two hundred seventy-nine thousand, one hundred fifty-three".