99961613 has 2 divisors, whose sum is σ = 99961614. Its totient is φ = 99961612.

The previous prime is 99961597. The next prime is 99961663. The reversal of 99961613 is 31616999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71199844 + 28761769 = 8438^2 + 5363^2 .

99961613 is a truncatable prime.

It is an emirp because it is prime and its reverse (31616999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99961613 - 2⁴ = 99961597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99961663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49980806 + 49980807.

It is an arithmetic number, because the mean of its divisors is an integer number (49980807).

Almost surely, 2^99961613 is an apocalyptic number.

It is an amenable number.

99961613 is a deficient number, since it is larger than the sum of its proper divisors (1).

99961613 is an equidigital number, since it uses as much as digits as its factorization.

99961613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 44.

The square root of 99961613 is about 9998.0804657694. The cubic root of 99961613 is about 464.0994835365.

The spelling of 99961613 in words is "ninety-nine million, nine hundred sixty-one thousand, six hundred thirteen".