425387491 has 4 divisors (see below), whose sum is σ = 425531232. Its totient is φ = 425243752.

The previous prime is 425387453. The next prime is 425387497. The reversal of 425387491 is 194783524.

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 425387491 - 2²⁵ = 391833059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425387497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67336 + ... + 73381.

It is an arithmetic number, because the mean of its divisors is an integer number (106382808).

Almost surely, 2^425387491 is an apocalyptic number.

425387491 is a deficient number, since it is larger than the sum of its proper divisors (143741).

425387491 is a wasteful number, since it uses less digits than its factorization.

425387491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143740.

The product of its digits is 241920, while the sum is 43.

The square root of 425387491 is about 20624.9240241025. The cubic root of 425387491 is about 752.0757259970.

The spelling of 425387491 in words is "four hundred twenty-five million, three hundred eighty-seven thousand, four hundred ninety-one".