81574249 has 8 divisors (see below), whose sum is σ = 82585152. Its totient is φ = 80567760.

The previous prime is 81574231. The next prime is 81574267. The reversal of 81574249 is 94247518.

It is an interprime number because it is at equal distance from previous prime (81574231) and next prime (81574267).

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 81574249 - 2⁷ = 81574121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81574219) 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, 49767 + ... + 51379.

It is an arithmetic number, because the mean of its divisors is an integer number (10323144).

Almost surely, 2^81574249 is an apocalyptic number.

It is an amenable number.

81574249 is a deficient number, since it is larger than the sum of its proper divisors (1010903).

81574249 is a wasteful number, since it uses less digits than its factorization.

81574249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207.

The product of its digits is 80640, while the sum is 40.

The square root of 81574249 is about 9031.8463782330. The cubic root of 81574249 is about 433.6949462138.

The spelling of 81574249 in words is "eighty-one million, five hundred seventy-four thousand, two hundred forty-nine".