616251481 has 2 divisors, whose sum is σ = 616251482. Its totient is φ = 616251480.

The previous prime is 616251439. The next prime is 616251499. The reversal of 616251481 is 184152616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 475022025 + 141229456 = 21795^2 + 11884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616251481 is a prime.

It is a super-2 number, since 2×616251481² = 759531775669386722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (616251281) 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, 308125740 + 308125741.

It is an arithmetic number, because the mean of its divisors is an integer number (308125741).

Almost surely, 2^616251481 is an apocalyptic number.

It is an amenable number.

616251481 is a deficient number, since it is larger than the sum of its proper divisors (1).

616251481 is an equidigital number, since it uses as much as digits as its factorization.

616251481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 616251481 is about 24824.4130041377. The cubic root of 616251481 is about 850.9799452423.

The spelling of 616251481 in words is "six hundred sixteen million, two hundred fifty-one thousand, four hundred eighty-one".