81001774 has 32 divisors (see below), whose sum is σ = 142663680. Its totient is φ = 33773568.

The previous prime is 81001771. The next prime is 81001777. The reversal of 81001774 is 47710018.

It is an interprime number because it is at equal distance from previous prime (81001771) and next prime (81001777).

It is a super-2 number, since 2×81001774² = 13122574782294152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81001771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168867 + ... + 169345.

It is an arithmetic number, because the mean of its divisors is an integer number (4458240).

Almost surely, 2^81001774 is an apocalyptic number.

81001774 is a deficient number, since it is larger than the sum of its proper divisors (61661906).

81001774 is a wasteful number, since it uses less digits than its factorization.

81001774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 81001774 is about 9000.0985550159. The cubic root of 81001774 is about 432.6780297738.

The spelling of 81001774 in words is "eighty-one million, one thousand, seven hundred seventy-four".