425561989 has 8 divisors (see below), whose sum is σ = 430470488. Its totient is φ = 420664320.

The previous prime is 425561977. The next prime is 425561993. The reversal of 425561989 is 989165524.

It can be written as a sum of positive squares in 4 ways, for example, as 72760900 + 352801089 = 8530^2 + 18783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 425561989 - 2¹¹ = 425559941 is a prime.

It is a super-2 number, since 2×425561989² = 362206012963272242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425561909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96889 + ... + 101185.

It is an arithmetic number, because the mean of its divisors is an integer number (53808811).

Almost surely, 2^425561989 is an apocalyptic number.

It is an amenable number.

425561989 is a deficient number, since it is larger than the sum of its proper divisors (4908499).

425561989 is a wasteful number, since it uses less digits than its factorization.

425561989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415.

The product of its digits is 777600, while the sum is 49.

The square root of 425561989 is about 20629.1538604956. The cubic root of 425561989 is about 752.1785481472.

The spelling of 425561989 in words is "four hundred twenty-five million, five hundred sixty-one thousand, nine hundred eighty-nine".