81241472949 has 32 divisors (see below), whose sum is σ = 133517739264. Its totient is φ = 42788874240.

The previous prime is 81241472783. The next prime is 81241472989. The reversal of 81241472949 is 94927414218.

It is not a de Polignac number, because 81241472949 - 2¹³ = 81241464757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241472989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37362 + ... + 404819.

It is an arithmetic number, because the mean of its divisors is an integer number (4172429352).

Almost surely, 2^81241472949 is an apocalyptic number.

It is an amenable number.

81241472949 is a deficient number, since it is larger than the sum of its proper divisors (52276266315).

81241472949 is a wasteful number, since it uses less digits than its factorization.

81241472949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442877.

The product of its digits is 1161216, while the sum is 51.

The spelling of 81241472949 in words is "eighty-one billion, two hundred forty-one million, four hundred seventy-two thousand, nine hundred forty-nine".