616921003 has 2 divisors, whose sum is σ = 616921004. Its totient is φ = 616921002.

The previous prime is 616920961. The next prime is 616921057. The reversal of 616921003 is 300129616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616921003 - 2²¹ = 614823851 is a prime.

It is not a weakly prime, because it can be changed into another prime (616921093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308460501 + 308460502.

It is an arithmetic number, because the mean of its divisors is an integer number (308460502).

Almost surely, 2^616921003 is an apocalyptic number.

616921003 is a deficient number, since it is larger than the sum of its proper divisors (1).

616921003 is an equidigital number, since it uses as much as digits as its factorization.

616921003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 616921003 is about 24837.8944961122. The cubic root of 616921003 is about 851.2880140548.

It can be divided in two parts, 6169 and 21003, that added together give a palindrome (27172).

The spelling of 616921003 in words is "six hundred sixteen million, nine hundred twenty-one thousand, three".