61345261 has 2 divisors, whose sum is σ = 61345262. Its totient is φ = 61345260.

The previous prime is 61345259. The next prime is 61345283. The reversal of 61345261 is 16254316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46376100 + 14969161 = 6810^2 + 3869^2 .

It is a cyclic number.

It is not a de Polignac number, because 61345261 - 2¹ = 61345259 is a prime.

Together with 61345259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61345861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30672630 + 30672631.

It is an arithmetic number, because the mean of its divisors is an integer number (30672631).

Almost surely, 2^61345261 is an apocalyptic number.

It is an amenable number.

61345261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61345261 is an equidigital number, since it uses as much as digits as its factorization.

61345261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 61345261 is about 7832.3215587717. The cubic root of 61345261 is about 394.3910094440.

Adding to 61345261 its reverse (16254316), we get a palindrome (77599577).

The spelling of 61345261 in words is "sixty-one million, three hundred forty-five thousand, two hundred sixty-one".