81119257 has 8 divisors (see below), whose sum is σ = 86778216. Its totient is φ = 75558912.

The previous prime is 81119237. The next prime is 81119267. The reversal of 81119257 is 75291118.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22382361 + 58736896 = 4731^2 + 7664^2 .

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-81119257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81119237) 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, 22948 + ... + 26245.

It is an arithmetic number, because the mean of its divisors is an integer number (10847277).

Almost surely, 2^81119257 is an apocalyptic number.

It is an amenable number.

81119257 is a deficient number, since it is larger than the sum of its proper divisors (5658959).

81119257 is a wasteful number, since it uses less digits than its factorization.

81119257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49307.

The product of its digits is 5040, while the sum is 34.

The square root of 81119257 is about 9006.6229520281. The cubic root of 81119257 is about 432.8871106162.

The spelling of 81119257 in words is "eighty-one million, one hundred nineteen thousand, two hundred fifty-seven".