4251491 has 2 divisors, whose sum is σ = 4251492. Its totient is φ = 4251490.

The previous prime is 4251463. The next prime is 4251493. The reversal of 4251491 is 1941524.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4251491 is a prime.

Together with 4251493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4251491.

It is not a weakly prime, because it can be changed into another prime (4251493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2125745 + 2125746.

It is an arithmetic number, because the mean of its divisors is an integer number (2125746).

Almost surely, 2^4251491 is an apocalyptic number.

4251491 is a deficient number, since it is larger than the sum of its proper divisors (1).

4251491 is an equidigital number, since it uses as much as digits as its factorization.

4251491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 4251491 is about 2061.9144017151. The cubic root of 4251491 is about 161.9995300500. Note that the first 3 decimals are identical.

The spelling of 4251491 in words is "four million, two hundred fifty-one thousand, four hundred ninety-one".