61136261 has 2 divisors, whose sum is σ = 61136262. Its totient is φ = 61136260.

The previous prime is 61136219. The next prime is 61136291. The reversal of 61136261 is 16263116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58828900 + 2307361 = 7670^2 + 1519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61136261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61136261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61136291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30568130 + 30568131.

It is an arithmetic number, because the mean of its divisors is an integer number (30568131).

Almost surely, 2^61136261 is an apocalyptic number.

It is an amenable number.

61136261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61136261 is an equidigital number, since it uses as much as digits as its factorization.

61136261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 61136261 is about 7818.9680265365. The cubic root of 61136261 is about 393.9426101917.

Adding to 61136261 its reverse (16263116), we get a palindrome (77399377).

The spelling of 61136261 in words is "sixty-one million, one hundred thirty-six thousand, two hundred sixty-one".