961998473272901 has 2 divisors, whose sum is σ = 961998473272902. Its totient is φ = 961998473272900.

The previous prime is 961998473272813. The next prime is 961998473272973. The reversal of 961998473272901 is 109272374899169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 763574343856801 + 198424129416100 = 27632849^2 + 14086310^2 .

It is a cyclic number.

It is not a de Polignac number, because 961998473272901 - 2³⁸ = 961723595365957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961998473872901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480999236636450 + 480999236636451.

It is an arithmetic number, because the mean of its divisors is an integer number (480999236636451).

Almost surely, 2^{961998473272901} is an apocalyptic number.

It is an amenable number.

961998473272901 is a deficient number, since it is larger than the sum of its proper divisors (1).

961998473272901 is an equidigital number, since it uses as much as digits as its factorization.

961998473272901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 740710656, while the sum is 77.

The spelling of 961998473272901 in words is "nine hundred sixty-one trillion, nine hundred ninety-eight billion, four hundred seventy-three million, two hundred seventy-two thousand, nine hundred one".