81922669 has 4 divisors (see below), whose sum is σ = 81986940. Its totient is φ = 81858400.

The previous prime is 81922667. The next prime is 81922679. The reversal of 81922669 is 96622918.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15288100 + 66634569 = 3910^2 + 8163^2 .

It is a cyclic number.

It is not a de Polignac number, because 81922669 - 2¹ = 81922667 is a prime.

It is a super-2 number, since 2×81922669² = 13422647392167122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81922663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30184 + ... + 32785.

It is an arithmetic number, because the mean of its divisors is an integer number (20496735).

Almost surely, 2^81922669 is an apocalyptic number.

It is an amenable number.

81922669 is a deficient number, since it is larger than the sum of its proper divisors (64271).

81922669 is a wasteful number, since it uses less digits than its factorization.

81922669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64270.

The product of its digits is 93312, while the sum is 43.

The square root of 81922669 is about 9051.1142407993. The cubic root of 81922669 is about 434.3115352580.

The spelling of 81922669 in words is "eighty-one million, nine hundred twenty-two thousand, six hundred sixty-nine".