613971389 has 2 divisors, whose sum is σ = 613971390. Its totient is φ = 613971388.

The previous prime is 613971373. The next prime is 613971401. The reversal of 613971389 is 983179316.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 601083289 + 12888100 = 24517^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 613971389 - 2⁴ = 613971373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613971349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306985694 + 306985695.

It is an arithmetic number, because the mean of its divisors is an integer number (306985695).

Almost surely, 2^613971389 is an apocalyptic number.

It is an amenable number.

613971389 is a deficient number, since it is larger than the sum of its proper divisors (1).

613971389 is an equidigital number, since it uses as much as digits as its factorization.

613971389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 613971389 is about 24778.4460570069. The cubic root of 613971389 is about 849.9291239634.

The spelling of 613971389 in words is "six hundred thirteen million, nine hundred seventy-one thousand, three hundred eighty-nine".