961615997 has 2 divisors, whose sum is σ = 961615998. Its totient is φ = 961615996.

The previous prime is 961615987. The next prime is 961616003. The reversal of 961615997 is 799516169.

It is a happy number.

961615997 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., 942858436 + 18757561 = 30706^2 + 4331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961615997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961615957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480807998 + 480807999.

It is an arithmetic number, because the mean of its divisors is an integer number (480807999).

Almost surely, 2^961615997 is an apocalyptic number.

It is an amenable number.

961615997 is a deficient number, since it is larger than the sum of its proper divisors (1).

961615997 is an equidigital number, since it uses as much as digits as its factorization.

961615997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 53.

The square root of 961615997 is about 31009.9338438507. The cubic root of 961615997 is about 987.0380460043.

The spelling of 961615997 in words is "nine hundred sixty-one million, six hundred fifteen thousand, nine hundred ninety-seven".