81210150 has 216 divisors, whose sum is σ = 264625920. Its totient is φ = 17781120.

The previous prime is 81210089. The next prime is 81210169. The reversal of 81210150 is 5101218.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 639387 + ... + 639513.

It is an arithmetic number, because the mean of its divisors is an integer number (1225120).

Almost surely, 2^81210150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81210150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132312960).

81210150 is an abundant number, since it is smaller than the sum of its proper divisors (183415770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81210150 is a wasteful number, since it uses less digits than its factorization.

81210150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81210150 is about 9011.6674372726. The cubic root of 81210150 is about 433.0487315968.

Adding to 81210150 its reverse (5101218), we get a palindrome (86311368).

The spelling of 81210150 in words is "eighty-one million, two hundred ten thousand, one hundred fifty".