81001137222 has 12 divisors (see below), whose sum is σ = 175502464020. Its totient is φ = 27000379068.

The previous prime is 81001137221. The next prime is 81001137247. The reversal of 81001137222 is 22273110018.

It is a super-2 number, since 2×81001137222² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81001137221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2250031572 + ... + 2250031607.

It is an arithmetic number, because the mean of its divisors is an integer number (14625205335).

Almost surely, 2^81001137222 is an apocalyptic number.

81001137222 is an abundant number, since it is smaller than the sum of its proper divisors (94501326798).

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

81001137222 is a wasteful number, since it uses less digits than its factorization.

81001137222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500063187 (or 4500063184 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The spelling of 81001137222 in words is "eighty-one billion, one million, one hundred thirty-seven thousand, two hundred twenty-two".