61599533 has 2 divisors, whose sum is σ = 61599534. Its totient is φ = 61599532.

The previous prime is 61599523. The next prime is 61599541. The reversal of 61599533 is 33599516.

Added to its reverse (33599516) it gives a square (95199049 = 9757²).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35200489 + 26399044 = 5933^2 + 5138^2 .

It is a cyclic number.

It is not a de Polignac number, because 61599533 - 2¹⁴ = 61583149 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61599523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30799766 + 30799767.

It is an arithmetic number, because the mean of its divisors is an integer number (30799767).

Almost surely, 2^61599533 is an apocalyptic number.

It is an amenable number.

61599533 is a deficient number, since it is larger than the sum of its proper divisors (1).

61599533 is an equidigital number, since it uses as much as digits as its factorization.

61599533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 41.

The square root of 61599533 is about 7848.5369974282. The cubic root of 61599533 is about 394.9351664140.

Adding to 61599533 its reverse (33599516), we get a square (95199049 = 9757²).

The spelling of 61599533 in words is "sixty-one million, five hundred ninety-nine thousand, five hundred thirty-three".