81013722 has 8 divisors (see below), whose sum is σ = 162027456. Its totient is φ = 27004572.

The previous prime is 81013703. The next prime is 81013741. The reversal of 81013722 is 22731018.

It is an interprime number because it is at equal distance from previous prime (81013703) and next prime (81013741).

It is a sphenic number, since it is the product of 3 distinct primes.

81013722 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81013692 and 81013701.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6751138 + ... + 6751149.

It is an arithmetic number, because the mean of its divisors is an integer number (20253432).

Almost surely, 2^81013722 is an apocalyptic number.

81013722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81013722 is a wasteful number, since it uses less digits than its factorization.

81013722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13502292.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81013722 is about 9000.7623010498. The cubic root of 81013722 is about 432.6993024887.

The spelling of 81013722 in words is "eighty-one million, thirteen thousand, seven hundred twenty-two".