81249273222 has 32 divisors (see below), whose sum is σ = 184208881920. Its totient is φ = 23683998240.

The previous prime is 81249273197. The next prime is 81249273247. The reversal of 81249273222 is 22237294218.

It is an interprime number because it is at equal distance from previous prime (81249273197) and next prime (81249273247).

It is a super-2 number, since 2×81249273222² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27410554 + ... + 27413517.

It is an arithmetic number, because the mean of its divisors is an integer number (5756527560).

Almost surely, 2^81249273222 is an apocalyptic number.

81249273222 is an abundant number, since it is smaller than the sum of its proper divisors (102959608698).

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

81249273222 is a wasteful number, since it uses less digits than its factorization.

81249273222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54824108.

The product of its digits is 193536, while the sum is 42.

The spelling of 81249273222 in words is "eighty-one billion, two hundred forty-nine million, two hundred seventy-three thousand, two hundred twenty-two".