891040553 has 4 divisors (see below), whose sum is σ = 959582148. Its totient is φ = 822498960.

The previous prime is 891040547. The next prime is 891040561. The reversal of 891040553 is 355040198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355040198 = 2 ⋅177520099.

It can be written as a sum of positive squares in 2 ways, for example, as 363741184 + 527299369 = 19072^2 + 22963^2 .

It is a cyclic number.

It is not a de Polignac number, because 891040553 - 2⁶ = 891040489 is a prime.

It is a super-3 number, since 3×891040553³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (891040543) 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, 34270778 + ... + 34270803.

It is an arithmetic number, because the mean of its divisors is an integer number (239895537).

Almost surely, 2^891040553 is an apocalyptic number.

It is an amenable number.

891040553 is a deficient number, since it is larger than the sum of its proper divisors (68541595).

891040553 is a wasteful number, since it uses less digits than its factorization.

891040553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68541594.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 891040553 is about 29850.3023937782. The cubic root of 891040553 is about 962.2748975584.

The spelling of 891040553 in words is "eight hundred ninety-one million, forty thousand, five hundred fifty-three".