81101522 has 4 divisors (see below), whose sum is σ = 121652286. Its totient is φ = 40550760.

The previous prime is 81101507. The next prime is 81101539. The reversal of 81101522 is 22510118.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22510118 = 2 ⋅11255059.

It can be written as a sum of positive squares in only one way, i.e., 81018001 + 83521 = 9001^2 + 289^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81101494 and 81101503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20275379 + ... + 20275382.

Almost surely, 2^81101522 is an apocalyptic number.

81101522 is a deficient number, since it is larger than the sum of its proper divisors (40550764).

81101522 is a wasteful number, since it uses less digits than its factorization.

81101522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40550763.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 81101522 is about 9005.6383449481. The cubic root of 81101522 is about 432.8555611307.

The spelling of 81101522 in words is "eighty-one million, one hundred one thousand, five hundred twenty-two".