425491376209 has 27 divisors (see below), whose sum is σ = 447694652379. Its totient is φ = 404371956240.

The previous prime is 425491376207. The next prime is 425491376231. The reversal of 425491376209 is 902673194524.

The square root of 425491376209 is 652297.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 223117356609 + 202374019600 = 472353^2 + 449860^2 .

It is not a de Polignac number, because 425491376209 - 2¹ = 425491376207 is a prime.

It is a super-2 number, since 2×425491376209² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425491376207) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1570078744 + ... + 1570079014.

Almost surely, 2^425491376209 is an apocalyptic number.

425491376209 is the 652297-th square number.

425491376209 is the 326149-th centered octagonal number.

It is an amenable number.

425491376209 is a deficient number, since it is larger than the sum of its proper divisors (22203276170).

425491376209 is an frugal number, since it uses more digits than its factorization.

425491376209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 425491376209 in words is "four hundred twenty-five billion, four hundred ninety-one million, three hundred seventy-six thousand, two hundred nine".