81598411 has 4 divisors (see below), whose sum is σ = 85146192. Its totient is φ = 78050632.

The previous prime is 81598409. The next prime is 81598423. The reversal of 81598411 is 11489518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81598411 - 2¹ = 81598409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81598481) 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, 1773856 + ... + 1773901.

It is an arithmetic number, because the mean of its divisors is an integer number (21286548).

Almost surely, 2^81598411 is an apocalyptic number.

81598411 is a deficient number, since it is larger than the sum of its proper divisors (3547781).

81598411 is a wasteful number, since it uses less digits than its factorization.

81598411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547780.

The product of its digits is 11520, while the sum is 37.

The square root of 81598411 is about 9033.1838794525. The cubic root of 81598411 is about 433.7377616160.

The spelling of 81598411 in words is "eighty-one million, five hundred ninety-eight thousand, four hundred eleven".