425609161 has 4 divisors (see below), whose sum is σ = 450645012. Its totient is φ = 400573312.

The previous prime is 425609153. The next prime is 425609201. The reversal of 425609161 is 161906524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 297217600 + 128391561 = 17240^2 + 11331^2 .

It is not a de Polignac number, because 425609161 - 2³ = 425609153 is a prime.

It is a super-2 number, since 2×425609161² = 362286315854247842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425639161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12517900 + ... + 12517933.

It is an arithmetic number, because the mean of its divisors is an integer number (112661253).

Almost surely, 2^425609161 is an apocalyptic number.

It is an amenable number.

425609161 is a deficient number, since it is larger than the sum of its proper divisors (25035851).

425609161 is a wasteful number, since it uses less digits than its factorization.

425609161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25035850.

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

The square root of 425609161 is about 20630.2971621836. The cubic root of 425609161 is about 752.2063392066.

The spelling of 425609161 in words is "four hundred twenty-five million, six hundred nine thousand, one hundred sixty-one".