81015450127 has 4 divisors (see below), whose sum is σ = 83628851776. Its totient is φ = 78402048480.

The previous prime is 81015450091. The next prime is 81015450143. The reversal of 81015450127 is 72105451018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81015450127 is a prime.

It is a super-2 number, since 2×81015450127² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81015450092 and 81015450101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81015450167) 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, 1306700778 + ... + 1306700839.

It is an arithmetic number, because the mean of its divisors is an integer number (20907212944).

Almost surely, 2^81015450127 is an apocalyptic number.

81015450127 is a deficient number, since it is larger than the sum of its proper divisors (2613401649).

81015450127 is a wasteful number, since it uses less digits than its factorization.

81015450127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613401648.

The product of its (nonzero) digits is 11200, while the sum is 34.

The spelling of 81015450127 in words is "eighty-one billion, fifteen million, four hundred fifty thousand, one hundred twenty-seven".