1613955397 has 2 divisors, whose sum is σ = 1613955398. Its totient is φ = 1613955396.

The previous prime is 1613955389. The next prime is 1613955403. The reversal of 1613955397 is 7935593161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859134721 + 754820676 = 29311^2 + 27474^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613955397 - 2³ = 1613955389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1613955397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1613959397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806977698 + 806977699.

It is an arithmetic number, because the mean of its divisors is an integer number (806977699).

Almost surely, 2^1613955397 is an apocalyptic number.

It is an amenable number.

1613955397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613955397 is an equidigital number, since it uses as much as digits as its factorization.

1613955397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 765450, while the sum is 49.

The square root of 1613955397 is about 40174.0637352011. The cubic root of 1613955397 is about 1172.9977421272.

The spelling of 1613955397 in words is "one billion, six hundred thirteen million, nine hundred fifty-five thousand, three hundred ninety-seven".