81980151 has 32 divisors (see below), whose sum is σ = 124256256. Its totient is φ = 47628000.

The previous prime is 81980147. The next prime is 81980153. The reversal of 81980151 is 15108918.

It is not a de Polignac number, because 81980151 - 2² = 81980147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81980153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129606 + ... + 130236.

It is an arithmetic number, because the mean of its divisors is an integer number (3883008).

Almost surely, 2^81980151 is an apocalyptic number.

81980151 is a deficient number, since it is larger than the sum of its proper divisors (42276105).

81980151 is a wasteful number, since it uses less digits than its factorization.

81980151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803.

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 81980151 is about 9054.2890941255. The cubic root of 81980151 is about 434.4130914338.

The spelling of 81980151 in words is "eighty-one million, nine hundred eighty thousand, one hundred fifty-one".