51609541 has 2 divisors, whose sum is σ = 51609542. Its totient is φ = 51609540.

The previous prime is 51609527. The next prime is 51609617. The reversal of 51609541 is 14590615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 772641 = 7130^2 + 879^2 .

It is a cyclic number.

It is not a de Polignac number, because 51609541 - 2¹⁹ = 51085253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51609521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25804770 + 25804771.

It is an arithmetic number, because the mean of its divisors is an integer number (25804771).

Almost surely, 2^51609541 is an apocalyptic number.

It is an amenable number.

51609541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51609541 is an equidigital number, since it uses as much as digits as its factorization.

51609541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51609541 is about 7183.9780762472. The cubic root of 51609541 is about 372.3145415555.

The spelling of 51609541 in words is "fifty-one million, six hundred nine thousand, five hundred forty-one".