81053357 has 16 divisors (see below), whose sum is σ = 105449472. Its totient is φ = 60411120.

The previous prime is 81053341. The next prime is 81053363. The reversal of 81053357 is 75335018.

It is not a de Polignac number, because 81053357 - 2⁴ = 81053341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81053257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21113 + ... + 24654.

It is an arithmetic number, because the mean of its divisors is an integer number (6590592).

Almost surely, 2^81053357 is an apocalyptic number.

It is an amenable number.

81053357 is a deficient number, since it is larger than the sum of its proper divisors (24396115).

81053357 is a wasteful number, since it uses less digits than its factorization.

81053357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45808.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 81053357 is about 9002.9637897750. The cubic root of 81053357 is about 432.7698553135.

The spelling of 81053357 in words is "eighty-one million, fifty-three thousand, three hundred fifty-seven".