81295449 has 4 divisors (see below), whose sum is σ = 108393936. Its totient is φ = 54196964.

The previous prime is 81295427. The next prime is 81295453. The reversal of 81295449 is 94459218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81295449 - 2¹⁶ = 81229913 is a prime.

It is a super-2 number, since 2×81295449² = 13217900056223202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81295449.

It is not an unprimeable number, because it can be changed into a prime (81295469) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13549239 + ... + 13549244.

It is an arithmetic number, because the mean of its divisors is an integer number (27098484).

Almost surely, 2^81295449 is an apocalyptic number.

It is an amenable number.

81295449 is a deficient number, since it is larger than the sum of its proper divisors (27098487).

81295449 is a wasteful number, since it uses less digits than its factorization.

81295449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27098486.

The product of its digits is 103680, while the sum is 42.

The square root of 81295449 is about 9016.3988931280. The cubic root of 81295449 is about 433.2002959784.

The spelling of 81295449 in words is "eighty-one million, two hundred ninety-five thousand, four hundred forty-nine".