51609137 has 2 divisors, whose sum is σ = 51609138. Its totient is φ = 51609136.

The previous prime is 51609091. The next prime is 51609139. The reversal of 51609137 is 73190615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27363361 + 24245776 = 5231^2 + 4924^2 .

It is a cyclic number.

It is not a de Polignac number, because 51609137 - 2¹⁴ = 51592753 is a prime.

Together with 51609139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51609139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25804568 + 25804569.

It is an arithmetic number, because the mean of its divisors is an integer number (25804569).

Almost surely, 2^51609137 is an apocalyptic number.

It is an amenable number.

51609137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51609137 is an equidigital number, since it uses as much as digits as its factorization.

51609137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 51609137 is about 7183.9499580662. The cubic root of 51609137 is about 372.3135700590.

The spelling of 51609137 in words is "fifty-one million, six hundred nine thousand, one hundred thirty-seven".