81053387 has 4 divisors (see below), whose sum is σ = 82195056. Its totient is φ = 79911720.

The previous prime is 81053383. The next prime is 81053407. The reversal of 81053387 is 78335018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78335018 = 2 ⋅39167509.

It is a cyclic number.

It is not a de Polignac number, because 81053387 - 2² = 81053383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81053383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570728 + ... + 570869.

It is an arithmetic number, because the mean of its divisors is an integer number (20548764).

Almost surely, 2^81053387 is an apocalyptic number.

81053387 is a deficient number, since it is larger than the sum of its proper divisors (1141669).

81053387 is a wasteful number, since it uses less digits than its factorization.

81053387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141668.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81053387 is about 9002.9654558929. The cubic root of 81053387 is about 432.7699087067.

The spelling of 81053387 in words is "eighty-one million, fifty-three thousand, three hundred eighty-seven".