81025953 has 8 divisors (see below), whose sum is σ = 108179616. Its totient is φ = 53944800.

The previous prime is 81025949. The next prime is 81025957. The reversal of 81025953 is 35952018.

It is an interprime number because it is at equal distance from previous prime (81025949) and next prime (81025957).

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

It is not a de Polignac number, because 81025953 - 2² = 81025949 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81025957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15463 + ... + 20028.

It is an arithmetic number, because the mean of its divisors is an integer number (13522452).

Almost surely, 2^81025953 is an apocalyptic number.

It is an amenable number.

81025953 is a deficient number, since it is larger than the sum of its proper divisors (27153663).

81025953 is a wasteful number, since it uses less digits than its factorization.

81025953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36255.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 81025953 is about 9001.4417178583. The cubic root of 81025953 is about 432.7210769022.

The spelling of 81025953 in words is "eighty-one million, twenty-five thousand, nine hundred fifty-three".