81023187 has 32 divisors (see below), whose sum is σ = 128494080. Its totient is φ = 44432640.

The previous prime is 81023171. The next prime is 81023191. The reversal of 81023187 is 78132018.

It is a happy number.

It is not a de Polignac number, because 81023187 - 2⁴ = 81023171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81023387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141612 + ... + 142182.

It is an arithmetic number, because the mean of its divisors is an integer number (4015440).

Almost surely, 2^81023187 is an apocalyptic number.

81023187 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

81023187 is a deficient number, since it is larger than the sum of its proper divisors (47470893).

81023187 is a wasteful number, since it uses less digits than its factorization.

81023187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81023187 is about 9001.2880744925. The cubic root of 81023187 is about 432.7161528827.

It can be divided in two parts, 8102318 and 7, that added together give a triangular number (8102325 = T₄₀₂₅).

The spelling of 81023187 in words is "eighty-one million, twenty-three thousand, one hundred eighty-seven".