81374253 has 8 divisors (see below), whose sum is σ = 113216448. Its totient is φ = 51890784.

The previous prime is 81374243. The next prime is 81374269. The reversal of 81374253 is 35247318.

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

It is not a de Polignac number, because 81374253 - 2⁵ = 81374221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81374243) 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, 589600 + ... + 589737.

It is an arithmetic number, because the mean of its divisors is an integer number (14152056).

Almost surely, 2^81374253 is an apocalyptic number.

It is an amenable number.

81374253 is a deficient number, since it is larger than the sum of its proper divisors (31842195).

81374253 is a wasteful number, since it uses less digits than its factorization.

81374253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179363.

The product of its digits is 20160, while the sum is 33.

The square root of 81374253 is about 9020.7678719719. The cubic root of 81374253 is about 433.3402254657.

The spelling of 81374253 in words is "eighty-one million, three hundred seventy-four thousand, two hundred fifty-three".