616441997 has 2 divisors, whose sum is σ = 616441998. Its totient is φ = 616441996.

The previous prime is 616441963. The next prime is 616442053. The reversal of 616441997 is 799144616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588256516 + 28185481 = 24254^2 + 5309^2 .

It is a cyclic number.

It is not a de Polignac number, because 616441997 - 2¹⁶ = 616376461 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 (616441907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308220998 + 308220999.

It is an arithmetic number, because the mean of its divisors is an integer number (308220999).

Almost surely, 2^616441997 is an apocalyptic number.

It is an amenable number.

616441997 is a deficient number, since it is larger than the sum of its proper divisors (1).

616441997 is an equidigital number, since it uses as much as digits as its factorization.

616441997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 616441997 is about 24828.2499786030. The cubic root of 616441997 is about 851.0676305439.

The spelling of 616441997 in words is "six hundred sixteen million, four hundred forty-one thousand, nine hundred ninety-seven".