904890061 has 4 divisors (see below), whose sum is σ = 908411292. Its totient is φ = 901368832.

The previous prime is 904890053. The next prime is 904890073. The reversal of 904890061 is 160098409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160098409 = 12653².

It can be written as a sum of positive squares in 2 ways, for example, as 528724036 + 376166025 = 22994^2 + 19395^2 .

It is a cyclic number.

It is not a de Polignac number, because 904890061 - 2³ = 904890053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 904890061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (904890361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760230 + ... + 1760743.

It is an arithmetic number, because the mean of its divisors is an integer number (227102823).

Almost surely, 2^904890061 is an apocalyptic number.

It is an amenable number.

904890061 is a deficient number, since it is larger than the sum of its proper divisors (3521231).

904890061 is a wasteful number, since it uses less digits than its factorization.

904890061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521230.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 904890061 is about 30081.3906094781. The cubic root of 904890061 is about 967.2348574926.

The spelling of 904890061 in words is "nine hundred four million, eight hundred ninety thousand, sixty-one".