891140545 has 4 divisors (see below), whose sum is σ = 1069368660. Its totient is φ = 712912432.

The previous prime is 891140533. The next prime is 891140567. The reversal of 891140545 is 545041198.

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 179104689 + 712035856 = 13383^2 + 26684^2 .

It is a cyclic number.

It is not a de Polignac number, because 891140545 - 2⁷ = 891140417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89114050 + ... + 89114059.

It is an arithmetic number, because the mean of its divisors is an integer number (267342165).

Almost surely, 2^891140545 is an apocalyptic number.

It is an amenable number.

891140545 is a deficient number, since it is larger than the sum of its proper divisors (178228115).

891140545 is a wasteful number, since it uses less digits than its factorization.

891140545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178228114.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 891140545 is about 29851.9772376973. The cubic root of 891140545 is about 962.3108915028.

The spelling of 891140545 in words is "eight hundred ninety-one million, one hundred forty thousand, five hundred forty-five".