4251891 has 8 divisors (see below), whose sum is σ = 6479104. Its totient is φ = 2429640.

The previous prime is 4251889. The next prime is 4251917. The reversal of 4251891 is 1981524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4251891 - 2¹ = 4251889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (4251491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101215 + ... + 101256.

It is an arithmetic number, because the mean of its divisors is an integer number (809888).

Almost surely, 2^4251891 is an apocalyptic number.

4251891 is a deficient number, since it is larger than the sum of its proper divisors (2227213).

4251891 is a wasteful number, since it uses less digits than its factorization.

4251891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202481.

The product of its digits is 2880, while the sum is 30.

The square root of 4251891 is about 2062.0113966707. The cubic root of 4251891 is about 162.0046104464.

The spelling of 4251891 in words is "four million, two hundred fifty-one thousand, eight hundred ninety-one".