81441458 has 16 divisors (see below), whose sum is σ = 147826944. Its totient is φ = 32850240.

The previous prime is 81441427. The next prime is 81441469. The reversal of 81441458 is 85414418.

It is a happy number.

It is a super-2 number, since 2×81441458² = 13265422162331528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170858 + ... + 171333.

It is an arithmetic number, because the mean of its divisors is an integer number (9239184).

Almost surely, 2^81441458 is an apocalyptic number.

81441458 is a deficient number, since it is larger than the sum of its proper divisors (66385486).

81441458 is a wasteful number, since it uses less digits than its factorization.

81441458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342217.

The product of its digits is 20480, while the sum is 35.

The square root of 81441458 is about 9024.4921186735. The cubic root of 81441458 is about 433.4594876616.

The spelling of 81441458 in words is "eighty-one million, four hundred forty-one thousand, four hundred fifty-eight".