81453237 has 8 divisors (see below), whose sum is σ = 108927936. Its totient is φ = 54140352.

The previous prime is 81453233. The next prime is 81453269. The reversal of 81453237 is 73235418.

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

It is not a de Polignac number, because 81453237 - 2² = 81453233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81453198 and 81453207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81453233) 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, 39273 + ... + 41294.

It is an arithmetic number, because the mean of its divisors is an integer number (13615992).

Almost surely, 2^81453237 is an apocalyptic number.

It is an amenable number.

81453237 is a deficient number, since it is larger than the sum of its proper divisors (27474699).

81453237 is a wasteful number, since it uses less digits than its factorization.

81453237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80907.

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

The square root of 81453237 is about 9025.1447079811. The cubic root of 81453237 is about 433.4803839524.

The spelling of 81453237 in words is "eighty-one million, four hundred fifty-three thousand, two hundred thirty-seven".