891257485 has 4 divisors (see below), whose sum is σ = 1069508988. Its totient is φ = 713005984.

The previous prime is 891257449. The next prime is 891257489. The reversal of 891257485 is 584752198.

It is a happy number.

891257485 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 700237444 + 191020041 = 26462^2 + 13821^2 .

It is a cyclic number.

It is not a de Polignac number, because 891257485 - 2¹⁵ = 891224717 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891257489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89125744 + ... + 89125753.

It is an arithmetic number, because the mean of its divisors is an integer number (267377247).

Almost surely, 2^891257485 is an apocalyptic number.

It is an amenable number.

891257485 is a deficient number, since it is larger than the sum of its proper divisors (178251503).

891257485 is a wasteful number, since it uses less digits than its factorization.

891257485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178251502.

The product of its digits is 806400, while the sum is 49.

The square root of 891257485 is about 29853.9358376747. The cubic root of 891257485 is about 962.3529827735.

The spelling of 891257485 in words is "eight hundred ninety-one million, two hundred fifty-seven thousand, four hundred eighty-five".