425155891 has 4 divisors (see below), whose sum is σ = 425537632. Its totient is φ = 424774152.

The previous prime is 425155883. The next prime is 425155901. The reversal of 425155891 is 198551524.

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 425155891 - 2³ = 425155883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425155831) 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, 189195 + ... + 191428.

It is an arithmetic number, because the mean of its divisors is an integer number (106384408).

Almost surely, 2^425155891 is an apocalyptic number.

425155891 is a deficient number, since it is larger than the sum of its proper divisors (381741).

425155891 is a wasteful number, since it uses less digits than its factorization.

425155891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381740.

The product of its digits is 72000, while the sum is 40.

The square root of 425155891 is about 20619.3086935523. The cubic root of 425155891 is about 751.9392133178.

The spelling of 425155891 in words is "four hundred twenty-five million, one hundred fifty-five thousand, eight hundred ninety-one".