81749301 has 8 divisors (see below), whose sum is σ = 109041120. Its totient is φ = 54478512.

The previous prime is 81749257. The next prime is 81749303. The reversal of 81749301 is 10394718.

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

It is not a de Polignac number, because 81749301 - 2¹⁹ = 81225013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81749303) 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, 10995 + ... + 16863.

It is an arithmetic number, because the mean of its divisors is an integer number (13630140).

Almost surely, 2^81749301 is an apocalyptic number.

It is an amenable number.

81749301 is a deficient number, since it is larger than the sum of its proper divisors (27291819).

81749301 is a wasteful number, since it uses less digits than its factorization.

81749301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81749301 is about 9041.5320051416. The cubic root of 81749301 is about 434.0049497903.

The spelling of 81749301 in words is "eighty-one million, seven hundred forty-nine thousand, three hundred one".