81149383 has 8 divisors (see below), whose sum is σ = 92845440. Its totient is φ = 69479160.

The previous prime is 81149371. The next prime is 81149389. The reversal of 81149383 is 38394118.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81149383 is a prime.

It is a super-2 number, since 2×81149383² = 13170444722561378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81149389) 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, 828 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (11605680).

Almost surely, 2^81149383 is an apocalyptic number.

81149383 is a deficient number, since it is larger than the sum of its proper divisors (11696057).

81149383 is a wasteful number, since it uses less digits than its factorization.

81149383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12917.

The product of its digits is 20736, while the sum is 37.

The square root of 81149383 is about 9008.2952327286. The cubic root of 81149383 is about 432.9406923982.

The spelling of 81149383 in words is "eighty-one million, one hundred forty-nine thousand, three hundred eighty-three".