609138257 has 12 divisors (see below), whose sum is σ = 763097076. Its totient is φ = 481955040.

The previous prime is 609138247. The next prime is 609138259. The reversal of 609138257 is 752831906.

It can be written as a sum of positive squares in 2 ways, for example, as 176331841 + 432806416 = 13279^2 + 20804^2 .

It is not a de Polignac number, because 609138257 - 2⁴ = 609138241 is a prime.

It is a super-2 number, since 2×609138257² = 742098832281996098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (609138259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 477494 + ... + 478767.

It is an arithmetic number, because the mean of its divisors is an integer number (63591423).

Almost surely, 2^609138257 is an apocalyptic number.

It is an amenable number.

609138257 is a deficient number, since it is larger than the sum of its proper divisors (153958819).

609138257 is a wasteful number, since it uses less digits than its factorization.

609138257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956288 (or 956281 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 609138257 is about 24680.7264277209. The cubic root of 609138257 is about 847.6930556852.

The spelling of 609138257 in words is "six hundred nine million, one hundred thirty-eight thousand, two hundred fifty-seven".