81124874 has 8 divisors (see below), whose sum is σ = 123983460. Its totient is φ = 39797056.

The previous prime is 81124859. The next prime is 81124891. The reversal of 81124874 is 47842118.

It can be written as a sum of positive squares in 2 ways, for example, as 75811849 + 5313025 = 8707^2 + 2305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382559 + ... + 382770.

Almost surely, 2^81124874 is an apocalyptic number.

81124874 is a deficient number, since it is larger than the sum of its proper divisors (42858586).

81124874 is a wasteful number, since it uses less digits than its factorization.

81124874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765384.

The product of its digits is 14336, while the sum is 35.

The square root of 81124874 is about 9006.9347727182. The cubic root of 81124874 is about 432.8971019585.

The spelling of 81124874 in words is "eighty-one million, one hundred twenty-four thousand, eight hundred seventy-four".