84497581 has 4 divisors (see below), whose sum is σ = 96568672. Its totient is φ = 72426492.

The previous prime is 84497551. The next prime is 84497659. The reversal of 84497581 is 18579448.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84497581 - 2¹¹ = 84495533 is a prime.

It is a super-2 number, since 2×84497581² = 14279682389703122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84497551) 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, 6035535 + ... + 6035548.

It is an arithmetic number, because the mean of its divisors is an integer number (24142168).

Almost surely, 2^84497581 is an apocalyptic number.

It is an amenable number.

84497581 is a deficient number, since it is larger than the sum of its proper divisors (12071091).

84497581 is a wasteful number, since it uses less digits than its factorization.

84497581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12071090.

The product of its digits is 322560, while the sum is 46.

The square root of 84497581 is about 9192.2565782293. The cubic root of 84497581 is about 438.8149603359.

It can be divided in two parts, 84497 and 581, that added together give a triangular number (85078 = T₄₁₂).

The spelling of 84497581 in words is "eighty-four million, four hundred ninety-seven thousand, five hundred eighty-one".