1961730773491 has 2 divisors, whose sum is σ = 1961730773492. Its totient is φ = 1961730773490.

The previous prime is 1961730773473. The next prime is 1961730773531. The reversal of 1961730773491 is 1943770371691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1961730773491 - 2²¹ = 1961728676339 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961730773411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980865386745 + 980865386746.

It is an arithmetic number, because the mean of its divisors is an integer number (980865386746).

Almost surely, 2^{1961730773491} is an apocalyptic number.

1961730773491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961730773491 is an equidigital number, since it uses as much as digits as its factorization.

1961730773491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6001128, while the sum is 58.

The spelling of 1961730773491 in words is "one trillion, nine hundred sixty-one billion, seven hundred thirty million, seven hundred seventy-three thousand, four hundred ninety-one".