81484142951 has 4 divisors (see below), whose sum is σ = 81484785000. Its totient is φ = 81483500904.

The previous prime is 81484142941. The next prime is 81484142959. The reversal of 81484142951 is 15924148418.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15924148418 = 2 ⋅7962074209.

It is a cyclic number.

It is not a de Polignac number, because 81484142951 - 2³⁴ = 64304273767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81484142896 and 81484142905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81484142959) 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, 59801 + ... + 408098.

It is an arithmetic number, because the mean of its divisors is an integer number (20371196250).

Almost surely, 2^81484142951 is an apocalyptic number.

81484142951 is a deficient number, since it is larger than the sum of its proper divisors (642049).

81484142951 is a wasteful number, since it uses less digits than its factorization.

81484142951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642048.

The product of its digits is 368640, while the sum is 47.

The spelling of 81484142951 in words is "eighty-one billion, four hundred eighty-four million, one hundred forty-two thousand, nine hundred fifty-one".