81447452101 has 4 divisors (see below), whose sum is σ = 81451754892. Its totient is φ = 81443149312.

The previous prime is 81447452077. The next prime is 81447452131. The reversal of 81447452101 is 10125474418.

It is a happy number.

It is a Cunningham number, because it is equal to 285390²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8561476 + 81438890625 = 2926^2 + 285375^2 .

It is a cyclic number.

It is not a de Polignac number, because 81447452101 - 2⁵ = 81447452069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81447452131) 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, 2122876 + ... + 2160901.

It is an arithmetic number, because the mean of its divisors is an integer number (20362938723).

Almost surely, 2^81447452101 is an apocalyptic number.

It is an amenable number.

81447452101 is a deficient number, since it is larger than the sum of its proper divisors (4302791).

81447452101 is a wasteful number, since it uses less digits than its factorization.

81447452101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302790.

The product of its (nonzero) digits is 35840, while the sum is 37.

The spelling of 81447452101 in words is "eighty-one billion, four hundred forty-seven million, four hundred fifty-two thousand, one hundred one".