4891051 has 4 divisors (see below), whose sum is σ = 5335704. Its totient is φ = 4446400.

The previous prime is 4891043. The next prime is 4891057. The reversal of 4891051 is 1501984.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4891051 - 2³ = 4891043 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (4891057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222310 + ... + 222331.

It is an arithmetic number, because the mean of its divisors is an integer number (1333926).

Almost surely, 2^4891051 is an apocalyptic number.

4891051 is a deficient number, since it is larger than the sum of its proper divisors (444653).

4891051 is a wasteful number, since it uses less digits than its factorization.

4891051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444652.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 4891051 is about 2211.5720652965. The cubic root of 4891051 is about 169.7464617377.

It can be divided in two parts, 489 and 1051, that added together give a triangular number (1540 = T₅₅).

The spelling of 4891051 in words is "four million, eight hundred ninety-one thousand, fifty-one".