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985531 is a prime number
BaseRepresentation
bin11110000100110111011
31212001220011
43300212323
5223014111
633042351
711243161
oct3604673
91761804
10985531
11613498
123b63b7
13286771
141b9231
15147021
hexf09bb

985531 has 2 divisors, whose sum is σ = 985532. Its totient is φ = 985530.

The previous prime is 985529. The next prime is 985547. The reversal of 985531 is 135589.

It is a weak prime.

It is an emirp because it is prime and its reverse (135589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985531 - 21 = 985529 is a prime.

It is a super-2 number, since 2×9855312 = 1942542703922, which contains 22 as substring.

Together with 985529, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 985493 and 985502.

It is not a weakly prime, because it can be changed into another prime (985571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492765 + 492766.

It is an arithmetic number, because the mean of its divisors is an integer number (492766).

2985531 is an apocalyptic number.

985531 is a deficient number, since it is larger than the sum of its proper divisors (1).

985531 is an equidigital number, since it uses as much as digits as its factorization.

985531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 985531 is about 992.7391399557. The cubic root of 985531 is about 99.5153549866.

The spelling of 985531 in words is "nine hundred eighty-five thousand, five hundred thirty-one".