613990381 has 2 divisors, whose sum is σ = 613990382. Its totient is φ = 613990380.

The previous prime is 613990369. The next prime is 613990393. The reversal of 613990381 is 183099316.

It is a balanced prime because it is at equal distance from previous prime (613990369) and next prime (613990393).

It can be written as a sum of positive squares in only one way, i.e., 608855625 + 5134756 = 24675^2 + 2266^2 .

It is a cyclic number.

It is not a de Polignac number, because 613990381 - 2¹³ = 613982189 is a prime.

It is a super-2 number, since 2×613990381² = 753968375921050322, which contains 22 as substring.

It is a congruent number.

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, 306995190 + 306995191.

It is an arithmetic number, because the mean of its divisors is an integer number (306995191).

Almost surely, 2^613990381 is an apocalyptic number.

It is an amenable number.

613990381 is a deficient number, since it is larger than the sum of its proper divisors (1).

613990381 is an equidigital number, since it uses as much as digits as its factorization.

613990381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 613990381 is about 24778.8292903438. The cubic root of 613990381 is about 849.9378875029.

The spelling of 613990381 in words is "six hundred thirteen million, nine hundred ninety thousand, three hundred eighty-one".