81225026 has 4 divisors (see below), whose sum is σ = 121837542. Its totient is φ = 40612512.

The previous prime is 81225013. The next prime is 81225037. The reversal of 81225026 is 62052218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62052218 = 2 ⋅31026109.

It can be written as a sum of positive squares in only one way, i.e., 81018001 + 207025 = 9001^2 + 455^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81224986 and 81225004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20306255 + ... + 20306258.

Almost surely, 2^81225026 is an apocalyptic number.

81225026 is a deficient number, since it is larger than the sum of its proper divisors (40612516).

81225026 is a wasteful number, since it uses less digits than its factorization.

81225026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40612515.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81225026 is about 9012.4927739222. The cubic root of 81225026 is about 433.0751718042.

The spelling of 81225026 in words is "eighty-one million, two hundred twenty-five thousand, twenty-six".