81343901 has 4 divisors (see below), whose sum is σ = 82324032. Its totient is φ = 80363772.

The previous prime is 81343891. The next prime is 81343931. The reversal of 81343901 is 10934318.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10934318 = 2 ⋅5467159.

It is a cyclic number.

It is not a de Polignac number, because 81343901 - 2²⁶ = 14235037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81343931) 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, 489941 + ... + 490106.

It is an arithmetic number, because the mean of its divisors is an integer number (20581008).

Almost surely, 2^81343901 is an apocalyptic number.

It is an amenable number.

81343901 is a deficient number, since it is larger than the sum of its proper divisors (980131).

81343901 is an equidigital number, since it uses as much as digits as its factorization.

81343901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980130.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 81343901 is about 9019.0853749147. The cubic root of 81343901 is about 433.2863411895.

The spelling of 81343901 in words is "eighty-one million, three hundred forty-three thousand, nine hundred one".