425525981 has 2 divisors, whose sum is σ = 425525982. Its totient is φ = 425525980.

The previous prime is 425525941. The next prime is 425525983. The reversal of 425525981 is 189525524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350962756 + 74563225 = 18734^2 + 8635^2 .

It is a cyclic number.

It is not a de Polignac number, because 425525981 - 2⁶ = 425525917 is a prime.

It is a super-2 number, since 2×425525981² = 362144721012024722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 425525983, it forms a pair of twin primes.

It is a Chen 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 (425525983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212762990 + 212762991.

It is an arithmetic number, because the mean of its divisors is an integer number (212762991).

Almost surely, 2^425525981 is an apocalyptic number.

It is an amenable number.

425525981 is a deficient number, since it is larger than the sum of its proper divisors (1).

425525981 is an equidigital number, since it uses as much as digits as its factorization.

425525981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 41.

The square root of 425525981 is about 20628.2810965916. The cubic root of 425525981 is about 752.1573328994.

The spelling of 425525981 in words is "four hundred twenty-five million, five hundred twenty-five thousand, nine hundred eighty-one".