84505031 has 4 divisors (see below), whose sum is σ = 91005432. Its totient is φ = 78004632.

The previous prime is 84505021. The next prime is 84505033. The reversal of 84505031 is 13050548.

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 84505031 - 2¹⁴ = 84488647 is a prime.

It is a super-2 number, since 2×84505031² = 14282200528621922, 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 (84505033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3250181 + ... + 3250206.

It is an arithmetic number, because the mean of its divisors is an integer number (22751358).

Almost surely, 2^84505031 is an apocalyptic number.

84505031 is a deficient number, since it is larger than the sum of its proper divisors (6500401).

84505031 is a wasteful number, since it uses less digits than its factorization.

84505031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6500400.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 84505031 is about 9192.6618016764. The cubic root of 84505031 is about 438.8278564659.

Adding to 84505031 its reverse (13050548), we get a palindrome (97555579).

The spelling of 84505031 in words is "eighty-four million, five hundred five thousand, thirty-one".