85902921 has 24 divisors (see below), whose sum is σ = 141490440. Its totient is φ = 49752576.

The previous prime is 85902919. The next prime is 85902931. The reversal of 85902921 is 12920958.

It can be written as a sum of positive squares in 4 ways, for example, as 81225 + 85821696 = 285^2 + 9264^2 .

It is not a de Polignac number, because 85902921 - 2¹ = 85902919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85902931) 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 23 ways as a sum of consecutive naturals, for example, 19606 + ... + 23583.

It is an arithmetic number, because the mean of its divisors is an integer number (5895435).

Almost surely, 2^85902921 is an apocalyptic number.

It is an amenable number.

85902921 is a deficient number, since it is larger than the sum of its proper divisors (55587519).

85902921 is a wasteful number, since it uses less digits than its factorization.

85902921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43225 (or 43222 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 85902921 is about 9268.3828686562. The cubic root of 85902921 is about 441.2343456529.

It can be divided in two parts, 8590 and 2921, that added together give a palindrome (11511).

The spelling of 85902921 in words is "eighty-five million, nine hundred two thousand, nine hundred twenty-one".