425879981 has 4 divisors (see below), whose sum is σ = 428988732. Its totient is φ = 422771232.

The previous prime is 425879977. The next prime is 425880001. The reversal of 425879981 is 189978524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 365956900 + 59923081 = 19130^2 + 7741^2 .

It is a cyclic number.

It is not a de Polignac number, because 425879981 - 2² = 425879977 is a prime.

It is a super-2 number, since 2×425879981² = 362747516433120722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425879941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1554170 + ... + 1554443.

It is an arithmetic number, because the mean of its divisors is an integer number (107247183).

Almost surely, 2^425879981 is an apocalyptic number.

It is an amenable number.

425879981 is a deficient number, since it is larger than the sum of its proper divisors (3108751).

425879981 is a wasteful number, since it uses less digits than its factorization.

425879981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108750.

The product of its digits is 1451520, while the sum is 53.

The square root of 425879981 is about 20636.8597659625. The cubic root of 425879981 is about 752.3658512241.

The spelling of 425879981 in words is "four hundred twenty-five million, eight hundred seventy-nine thousand, nine hundred eighty-one".