81047151 has 12 divisors (see below), whose sum is σ = 117278512. Its totient is φ = 53934336.

The previous prime is 81047149. The next prime is 81047159. The reversal of 81047151 is 15174018.

It is not a de Polignac number, because 81047151 - 2¹ = 81047149 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 (81047159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2611 + ... + 12996.

Almost surely, 2^81047151 is an apocalyptic number.

81047151 is a deficient number, since it is larger than the sum of its proper divisors (36231361).

81047151 is a wasteful number, since it uses less digits than its factorization.

81047151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16190 (or 16187 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81047151 is about 9002.6191189009. The cubic root of 81047151 is about 432.7588097571.

It can be divided in two parts, 810 and 47151, that added together give a square (47961 = 219²).

The spelling of 81047151 in words is "eighty-one million, forty-seven thousand, one hundred fifty-one".