81264253 has 8 divisors (see below), whose sum is σ = 93742272. Its totient is φ = 69003456.

The previous prime is 81264241. The next prime is 81264307. The reversal of 81264253 is 35246218.

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-81264253 is a prime.

It is a super-4 number, since 4×81264253⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81264203) 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, 53500 + ... + 54997.

It is an arithmetic number, because the mean of its divisors is an integer number (11717784).

Almost surely, 2^81264253 is an apocalyptic number.

It is an amenable number.

81264253 is a deficient number, since it is larger than the sum of its proper divisors (12478019).

81264253 is a wasteful number, since it uses less digits than its factorization.

81264253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108611.

The product of its digits is 11520, while the sum is 31.

The square root of 81264253 is about 9014.6687681800. The cubic root of 81264253 is about 433.1448773558.

The spelling of 81264253 in words is "eighty-one million, two hundred sixty-four thousand, two hundred fifty-three".