81007753 has 4 divisors (see below), whose sum is σ = 81391888. Its totient is φ = 80623620.

The previous prime is 81007739. The next prime is 81007777. The reversal of 81007753 is 35770018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81007753 - 2²⁵ = 47453321 is a prime.

It is a super-2 number, since 2×81007753² = 13124512092218018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81007793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191751 + ... + 192172.

It is an arithmetic number, because the mean of its divisors is an integer number (20347972).

Almost surely, 2^81007753 is an apocalyptic number.

It is an amenable number.

81007753 is a deficient number, since it is larger than the sum of its proper divisors (384135).

81007753 is a wasteful number, since it uses less digits than its factorization.

81007753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384134.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 81007753 is about 9000.4307119160. The cubic root of 81007753 is about 432.6886752949.

The spelling of 81007753 in words is "eighty-one million, seven thousand, seven hundred fifty-three".