81234949 has 8 divisors (see below), whose sum is σ = 82027800. Its totient is φ = 80445696.

The previous prime is 81234947. The next prime is 81234953. The reversal of 81234949 is 94943218.

It can be written as a sum of positive squares in 4 ways, for example, as 11512449 + 69722500 = 3393^2 + 8350^2 .

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

It is not a de Polignac number, because 81234949 - 2¹ = 81234947 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81234947) 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, 67497 + ... + 68689.

It is an arithmetic number, because the mean of its divisors is an integer number (10253475).

Almost surely, 2^81234949 is an apocalyptic number.

It is an amenable number.

81234949 is a deficient number, since it is larger than the sum of its proper divisors (792851).

81234949 is a wasteful number, since it uses less digits than its factorization.

81234949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799.

The product of its digits is 62208, while the sum is 40.

The square root of 81234949 is about 9013.0432707272. The cubic root of 81234949 is about 433.0928068860.

The spelling of 81234949 in words is "eighty-one million, two hundred thirty-four thousand, nine hundred forty-nine".