616607261 has 2 divisors, whose sum is σ = 616607262. Its totient is φ = 616607260.

The previous prime is 616607227. The next prime is 616607269. The reversal of 616607261 is 162706616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578402500 + 38204761 = 24050^2 + 6181^2 .

It is a cyclic number.

It is not a de Polignac number, because 616607261 - 2¹⁸ = 616345117 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 (616607269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308303630 + 308303631.

It is an arithmetic number, because the mean of its divisors is an integer number (308303631).

Almost surely, 2^616607261 is an apocalyptic number.

It is an amenable number.

616607261 is a deficient number, since it is larger than the sum of its proper divisors (1).

616607261 is an equidigital number, since it uses as much as digits as its factorization.

616607261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 616607261 is about 24831.5778999241. The cubic root of 616607261 is about 851.1436789390.

It can be divided in two parts, 61660 and 7261, that added together give a cube (68921 = 41³).

The spelling of 616607261 in words is "six hundred sixteen million, six hundred seven thousand, two hundred sixty-one".