85470521 has 2 divisors, whose sum is σ = 85470522. Its totient is φ = 85470520.

The previous prime is 85470499. The next prime is 85470547. The reversal of 85470521 is 12507458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82446400 + 3024121 = 9080^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 85470521 - 2⁶ = 85470457 is a prime.

It is a super-2 number, since 2×85470521² = 14610419920022882, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (85470551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42735260 + 42735261.

It is an arithmetic number, because the mean of its divisors is an integer number (42735261).

Almost surely, 2^85470521 is an apocalyptic number.

It is an amenable number.

85470521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85470521 is an equidigital number, since it uses as much as digits as its factorization.

85470521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 85470521 is about 9245.0268252721. The cubic root of 85470521 is about 440.4927692079.

Adding to 85470521 its reverse (12507458), we get a palindrome (97977979).

The spelling of 85470521 in words is "eighty-five million, four hundred seventy thousand, five hundred twenty-one".