613990369 has 2 divisors, whose sum is σ = 613990370. Its totient is φ = 613990368.

The previous prime is 613990367. The next prime is 613990381. The reversal of 613990369 is 963099316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426629025 + 187361344 = 20655^2 + 13688^2 .

It is a cyclic number.

It is not a de Polignac number, because 613990369 - 2¹ = 613990367 is a prime.

It is a super-2 number, since 2×613990369² = 753968346449512322, which contains 22 as substring.

Together with 613990367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (613990361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306995184 + 306995185.

It is an arithmetic number, because the mean of its divisors is an integer number (306995185).

Almost surely, 2^613990369 is an apocalyptic number.

It is an amenable number.

613990369 is a deficient number, since it is larger than the sum of its proper divisors (1).

613990369 is an equidigital number, since it uses as much as digits as its factorization.

613990369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 613990369 is about 24778.8290482016. The cubic root of 613990369 is about 849.9378819657.

The spelling of 613990369 in words is "six hundred thirteen million, nine hundred ninety thousand, three hundred sixty-nine".