81300949 has 8 divisors (see below), whose sum is σ = 85361760. Its totient is φ = 77324016.

The previous prime is 81300931. The next prime is 81300959. The reversal of 81300949 is 94900318.

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 81300949 - 2⁹ = 81300437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81300959) 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, 18979 + ... + 22864.

It is an arithmetic number, because the mean of its divisors is an integer number (10670220).

Almost surely, 2^81300949 is an apocalyptic number.

It is an amenable number.

81300949 is a deficient number, since it is larger than the sum of its proper divisors (4060811).

81300949 is a wasteful number, since it uses less digits than its factorization.

81300949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41939.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 81300949 is about 9016.7038877852. The cubic root of 81300949 is about 433.2100650693.

The spelling of 81300949 in words is "eighty-one million, three hundred thousand, nine hundred forty-nine".