61061261 has 2 divisors, whose sum is σ = 61061262. Its totient is φ = 61061260.

The previous prime is 61061249. The next prime is 61061279. The reversal of 61061261 is 16216016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48916036 + 12145225 = 6994^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 61061261 - 2¹⁸ = 60799117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61061201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30530630 + 30530631.

It is an arithmetic number, because the mean of its divisors is an integer number (30530631).

Almost surely, 2^61061261 is an apocalyptic number.

It is an amenable number.

61061261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61061261 is an equidigital number, since it uses as much as digits as its factorization.

61061261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 61061261 is about 7814.1705253981. The cubic root of 61061261 is about 393.7814522285.

Adding to 61061261 its reverse (16216016), we get a palindrome (77277277).

The spelling of 61061261 in words is "sixty-one million, sixty-one thousand, two hundred sixty-one".