81155151 has 48 divisors (see below), whose sum is σ = 147184128. Its totient is φ = 41860800.

The previous prime is 81155119. The next prime is 81155177. The reversal of 81155151 is 15155118.

It is not a de Polignac number, because 81155151 - 2⁵ = 81155119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81155651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125110 + ... + 125756.

It is an arithmetic number, because the mean of its divisors is an integer number (3066336).

Almost surely, 2^81155151 is an apocalyptic number.

81155151 is a deficient number, since it is larger than the sum of its proper divisors (66028977).

81155151 is a wasteful number, since it uses less digits than its factorization.

81155151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 849 counting only the distinct ones).

The product of its digits is 1000, while the sum is 27.

The square root of 81155151 is about 9008.6153764050. The cubic root of 81155151 is about 432.9509497887.

The spelling of 81155151 in words is "eighty-one million, one hundred fifty-five thousand, one hundred fifty-one".