961813613 has 2 divisors, whose sum is σ = 961813614. Its totient is φ = 961813612.

The previous prime is 961813591. The next prime is 961813627. The reversal of 961813613 is 316318169.

961813613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631919044 + 329894569 = 25138^2 + 18163^2 .

961813613 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 961813613 - 2¹⁶ = 961748077 is a prime.

It is a super-2 number, since 2×961813613² = 1850170852304227538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961813663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480906806 + 480906807.

It is an arithmetic number, because the mean of its divisors is an integer number (480906807).

Almost surely, 2^961813613 is an apocalyptic number.

It is an amenable number.

961813613 is a deficient number, since it is larger than the sum of its proper divisors (1).

961813613 is an equidigital number, since it uses as much as digits as its factorization.

961813613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 961813613 is about 31013.1200139554. The cubic root of 961813613 is about 987.1056548181.

The spelling of 961813613 in words is "nine hundred sixty-one million, eight hundred thirteen thousand, six hundred thirteen".