81364922 has 4 divisors (see below), whose sum is σ = 122047386. Its totient is φ = 40682460.

The previous prime is 81364919. The next prime is 81364939. The reversal of 81364922 is 22946318.

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

It can be written as a sum of positive squares in only one way, i.e., 81018001 + 346921 = 9001^2 + 589^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20341229 + ... + 20341232.

Almost surely, 2^81364922 is an apocalyptic number.

81364922 is a deficient number, since it is larger than the sum of its proper divisors (40682464).

81364922 is a wasteful number, since it uses less digits than its factorization.

81364922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40682463.

The product of its digits is 20736, while the sum is 35.

The square root of 81364922 is about 9020.2506617056. The cubic root of 81364922 is about 433.3236614541.

The spelling of 81364922 in words is "eighty-one million, three hundred sixty-four thousand, nine hundred twenty-two".