81056001 has 16 divisors (see below), whose sum is σ = 116855424. Its totient is φ = 49680384.

The previous prime is 81055993. The next prime is 81056009. The reversal of 81056001 is 10065018.

It is an interprime number because it is at equal distance from previous prime (81055993) and next prime (81056009).

It is not a de Polignac number, because 81056001 - 2³ = 81055993 is a prime.

It is a super-2 number, since 2×81056001² = 13140150596224002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81056009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5980 + ... + 14066.

It is an arithmetic number, because the mean of its divisors is an integer number (7303464).

Almost surely, 2^81056001 is an apocalyptic number.

It is an amenable number.

81056001 is a deficient number, since it is larger than the sum of its proper divisors (35799423).

81056001 is a wasteful number, since it uses less digits than its factorization.

81056001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8360.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 81056001 is about 9003.1106291104. The cubic root of 81056001 is about 432.7745609835.

The spelling of 81056001 in words is "eighty-one million, fifty-six thousand, one".