85181501 has 2 divisors, whose sum is σ = 85181502. Its totient is φ = 85181500.

The previous prime is 85181431. The next prime is 85181519. The reversal of 85181501 is 10518158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 26275876 = 7675^2 + 5126^2 .

It is a cyclic number.

It is not a de Polignac number, because 85181501 - 2²² = 80987197 is a prime.

It is a super-2 number, since 2×85181501² = 14511776225226002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85151501) 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 as a sum of consecutive naturals, namely, 42590750 + 42590751.

It is an arithmetic number, because the mean of its divisors is an integer number (42590751).

Almost surely, 2^85181501 is an apocalyptic number.

It is an amenable number.

85181501 is a deficient number, since it is larger than the sum of its proper divisors (1).

85181501 is an equidigital number, since it uses as much as digits as its factorization.

85181501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 85181501 is about 9229.3824820515. The cubic root of 85181501 is about 439.9956972720.

Adding to 85181501 its reverse (10518158), we get a palindrome (95699659).

The spelling of 85181501 in words is "eighty-five million, one hundred eighty-one thousand, five hundred one".