81954293 has 8 divisors (see below), whose sum is σ = 83494656. Its totient is φ = 80420400.

The previous prime is 81954289. The next prime is 81954311. The reversal of 81954293 is 39245918.

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

It is a cyclic number.

It is not a de Polignac number, because 81954293 - 2² = 81954289 is a prime.

It is a super-2 number, since 2×81954293² = 13433012282259698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81954293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81950293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29348 + ... + 32018.

It is an arithmetic number, because the mean of its divisors is an integer number (10436832).

Almost surely, 2^81954293 is an apocalyptic number.

It is an amenable number.

81954293 is a deficient number, since it is larger than the sum of its proper divisors (1540363).

81954293 is a wasteful number, since it uses less digits than its factorization.

81954293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235.

The product of its digits is 77760, while the sum is 41.

The square root of 81954293 is about 9052.8610394725. The cubic root of 81954293 is about 434.3674127550.

The spelling of 81954293 in words is "eighty-one million, nine hundred fifty-four thousand, two hundred ninety-three".