78485531 has 4 divisors (see below), whose sum is σ = 78668064. Its totient is φ = 78303000.

The previous prime is 78485507. The next prime is 78485543. The reversal of 78485531 is 13558487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13558487 = 1459 ⋅9293.

It is a cyclic number.

It is not a de Polignac number, because 78485531 - 2¹⁰ = 78484507 is a prime.

It is a super-2 number, since 2×78485531² = 12319957152703922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78485551) 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, 90620 + ... + 91481.

It is an arithmetic number, because the mean of its divisors is an integer number (19667016).

Almost surely, 2^78485531 is an apocalyptic number.

78485531 is a deficient number, since it is larger than the sum of its proper divisors (182533).

78485531 is a wasteful number, since it uses less digits than its factorization.

78485531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182532.

The product of its digits is 134400, while the sum is 41.

The square root of 78485531 is about 8859.2060027973. The cubic root of 78485531 is about 428.1505769862.

The spelling of 78485531 in words is "seventy-eight million, four hundred eighty-five thousand, five hundred thirty-one".