616061261 has 2 divisors, whose sum is σ = 616061262. Its totient is φ = 616061260.

The previous prime is 616061183. The next prime is 616061267. The reversal of 616061261 is 162160616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582305161 + 33756100 = 24131^2 + 5810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616061261 is a prime.

It is a Sophie Germain 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 (616061267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308030630 + 308030631.

It is an arithmetic number, because the mean of its divisors is an integer number (308030631).

Almost surely, 2^616061261 is an apocalyptic number.

It is an amenable number.

616061261 is a deficient number, since it is larger than the sum of its proper divisors (1).

616061261 is an equidigital number, since it uses as much as digits as its factorization.

616061261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 616061261 is about 24820.5813993146. The cubic root of 616061261 is about 850.8923781433.

The spelling of 616061261 in words is "six hundred sixteen million, sixty-one thousand, two hundred sixty-one".