425920921 has 2 divisors, whose sum is σ = 425920922. Its totient is φ = 425920920.

The previous prime is 425920919. The next prime is 425920927. The reversal of 425920921 is 129029524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424566025 + 1354896 = 20605^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 425920921 - 2¹ = 425920919 is a prime.

Together with 425920919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (425920927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212960460 + 212960461.

It is an arithmetic number, because the mean of its divisors is an integer number (212960461).

Almost surely, 2^425920921 is an apocalyptic number.

It is an amenable number.

425920921 is a deficient number, since it is larger than the sum of its proper divisors (1).

425920921 is an equidigital number, since it uses as much as digits as its factorization.

425920921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 425920921 is about 20637.8516566042. The cubic root of 425920921 is about 752.3899588541.

The spelling of 425920921 in words is "four hundred twenty-five million, nine hundred twenty thousand, nine hundred twenty-one".