81822051 has 12 divisors (see below), whose sum is σ = 122000320. Its totient is φ = 52788240.

The previous prime is 81822047. The next prime is 81822053. The reversal of 81822051 is 15022818.

It is not a de Polignac number, because 81822051 - 2² = 81822047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81822053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146356 + ... + 146913.

Almost surely, 2^81822051 is an apocalyptic number.

81822051 is a deficient number, since it is larger than the sum of its proper divisors (40178269).

81822051 is a wasteful number, since it uses less digits than its factorization.

81822051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293306 (or 293303 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 81822051 is about 9045.5542118767. The cubic root of 81822051 is about 434.1336542494.

Adding to 81822051 its reverse (15022818), we get a palindrome (96844869).

The spelling of 81822051 in words is "eighty-one million, eight hundred twenty-two thousand, fifty-one".