81948361 has 8 divisors (see below), whose sum is σ = 90000000. Its totient is φ = 73997040.

The previous prime is 81948353. The next prime is 81948367. The reversal of 81948361 is 16384918.

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 81948361 - 2³ = 81948353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81948367) 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, 23361 + ... + 26638.

It is an arithmetic number, because the mean of its divisors is an integer number (11250000).

Almost surely, 2^81948361 is an apocalyptic number.

It is an amenable number.

81948361 is a deficient number, since it is larger than the sum of its proper divisors (8051639).

81948361 is a wasteful number, since it uses less digits than its factorization.

81948361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50159.

The product of its digits is 41472, while the sum is 40.

The square root of 81948361 is about 9052.5334023134. The cubic root of 81948361 is about 434.3569324024.

The spelling of 81948361 in words is "eighty-one million, nine hundred forty-eight thousand, three hundred sixty-one".