85130531 has 2 divisors, whose sum is σ = 85130532. Its totient is φ = 85130530.

The previous prime is 85130503. The next prime is 85130533. The reversal of 85130531 is 13503158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85130531 - 2¹⁸ = 84868387 is a prime.

It is a super-2 number, since 2×85130531² = 14494414616683922, which contains 22 as substring.

Together with 85130533, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85130531.

It is not a weakly prime, because it can be changed into another prime (85130533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42565265 + 42565266.

It is an arithmetic number, because the mean of its divisors is an integer number (42565266).

Almost surely, 2^85130531 is an apocalyptic number.

85130531 is a deficient number, since it is larger than the sum of its proper divisors (1).

85130531 is an equidigital number, since it uses as much as digits as its factorization.

85130531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 85130531 is about 9226.6207790285. The cubic root of 85130531 is about 439.9079197810.

Adding to 85130531 its reverse (13503158), we get a palindrome (98633689).

The spelling of 85130531 in words is "eighty-five million, one hundred thirty thousand, five hundred thirty-one".