81513022 has 4 divisors (see below), whose sum is σ = 122269536. Its totient is φ = 40756510.

The previous prime is 81513017. The next prime is 81513037. The reversal of 81513022 is 22031518.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 81512984 and 81513002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20378254 + ... + 20378257.

It is an arithmetic number, because the mean of its divisors is an integer number (30567384).

Almost surely, 2^81513022 is an apocalyptic number.

81513022 is a deficient number, since it is larger than the sum of its proper divisors (40756514).

81513022 is a wasteful number, since it uses less digits than its factorization.

81513022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40756513.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81513022 is about 9028.4562357028. The cubic root of 81513022 is about 433.5864132431.

The spelling of 81513022 in words is "eighty-one million, five hundred thirteen thousand, twenty-two".