61268209 has 2 divisors, whose sum is σ = 61268210. Its totient is φ = 61268208.

The previous prime is 61268203. The next prime is 61268237. The reversal of 61268209 is 90286216.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44890000 + 16378209 = 6700^2 + 4047^2 .

It is a cyclic number.

It is not a de Polignac number, because 61268209 - 2⁵ = 61268177 is a prime.

It is not a weakly prime, because it can be changed into another prime (61268203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30634104 + 30634105.

It is an arithmetic number, because the mean of its divisors is an integer number (30634105).

Almost surely, 2^61268209 is an apocalyptic number.

It is an amenable number.

61268209 is a deficient number, since it is larger than the sum of its proper divisors (1).

61268209 is an equidigital number, since it uses as much as digits as its factorization.

61268209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 61268209 is about 7827.4011651378. The cubic root of 61268209 is about 394.2258168519.

The spelling of 61268209 in words is "sixty-one million, two hundred sixty-eight thousand, two hundred nine".