425897981 has 2 divisors, whose sum is σ = 425897982. Its totient is φ = 425897980.

The previous prime is 425897971. The next prime is 425897993. The reversal of 425897981 is 189798524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318444025 + 107453956 = 17845^2 + 10366^2 .

It is a cyclic number.

It is not a de Polignac number, because 425897981 - 2⁶ = 425897917 is a prime.

It is a super-2 number, since 2×425897981² = 362778180439752722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425897971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212948990 + 212948991.

It is an arithmetic number, because the mean of its divisors is an integer number (212948991).

Almost surely, 2^425897981 is an apocalyptic number.

It is an amenable number.

425897981 is a deficient number, since it is larger than the sum of its proper divisors (1).

425897981 is an equidigital number, since it uses as much as digits as its factorization.

425897981 is an odious number, because the sum of its binary digits is odd.

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

The square root of 425897981 is about 20637.2958742176. The cubic root of 425897981 is about 752.3764507632.

The spelling of 425897981 in words is "four hundred twenty-five million, eight hundred ninety-seven thousand, nine hundred eighty-one".