425811681 has 32 divisors (see below), whose sum is σ = 646778880. Its totient is φ = 276747408.

The previous prime is 425811653. The next prime is 425811697. The reversal of 425811681 is 186118524.

It is not a de Polignac number, because 425811681 - 2⁵ = 425811649 is a prime.

It is a super-2 number, since 2×425811681² = 362631175352091522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (425311681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439860 + ... + 440826.

It is an arithmetic number, because the mean of its divisors is an integer number (20211840).

Almost surely, 2^425811681 is an apocalyptic number.

It is an amenable number.

425811681 is a deficient number, since it is larger than the sum of its proper divisors (220967199).

425811681 is a wasteful number, since it uses less digits than its factorization.

425811681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370 (or 1364 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 425811681 is about 20635.2048935793. The cubic root of 425811681 is about 752.3256291450.

The spelling of 425811681 in words is "four hundred twenty-five million, eight hundred eleven thousand, six hundred eighty-one".