616651031 has 2 divisors, whose sum is σ = 616651032. Its totient is φ = 616651030.

The previous prime is 616651001. The next prime is 616651033. The reversal of 616651031 is 130156616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616651031 is a prime.

It is a super-2 number, since 2×616651031² = 760516988066725922, which contains 22 as substring.

Together with 616651033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 616650985 and 616651003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616651033) 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, 308325515 + 308325516.

It is an arithmetic number, because the mean of its divisors is an integer number (308325516).

Almost surely, 2^616651031 is an apocalyptic number.

616651031 is a deficient number, since it is larger than the sum of its proper divisors (1).

616651031 is an equidigital number, since it uses as much as digits as its factorization.

616651031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 616651031 is about 24832.4592217525. The cubic root of 616651031 is about 851.1638180019.

The spelling of 616651031 in words is "six hundred sixteen million, six hundred fifty-one thousand, thirty-one".