81225754 has 4 divisors (see below), whose sum is σ = 121838634. Its totient is φ = 40612876.

The previous prime is 81225737. The next prime is 81225757. The reversal of 81225754 is 45752218.

It is a happy number.

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., 70812225 + 10413529 = 8415^2 + 3227^2 .

It is a super-2 number, since 2×81225754² = 13195246225737032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81225757) by changing a digit.

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, 20306437 + ... + 20306440.

Almost surely, 2^81225754 is an apocalyptic number.

81225754 is a deficient number, since it is larger than the sum of its proper divisors (40612880).

81225754 is a wasteful number, since it uses less digits than its factorization.

81225754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40612879.

The product of its digits is 22400, while the sum is 34.

The square root of 81225754 is about 9012.5331622136. The cubic root of 81225754 is about 433.0764656492.

The spelling of 81225754 in words is "eighty-one million, two hundred twenty-five thousand, seven hundred fifty-four".