81001910 has 16 divisors (see below), whose sum is σ = 159058512. Its totient is φ = 29455200.

The previous prime is 81001873. The next prime is 81001927. The reversal of 81001910 is 1910018.

It is a super-2 number, since 2×81001910² = 13122618847296200, which contains 22 as substring.

It is a congruent number.

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, 368081 + ... + 368300.

It is an arithmetic number, because the mean of its divisors is an integer number (9941157).

Almost surely, 2^81001910 is an apocalyptic number.

81001910 is a deficient number, since it is larger than the sum of its proper divisors (78056602).

81001910 is a wasteful number, since it uses less digits than its factorization.

81001910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736399.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 81001910 is about 9000.1061104856. The cubic root of 81001910 is about 432.6782719256.

Adding to 81001910 its reverse (1910018), we get a palindrome (82911928).

The spelling of 81001910 in words is "eighty-one million, one thousand, nine hundred ten".