1261241197573 has 12 divisors (see below), whose sum is σ = 1469764124640. Its totient is φ = 1079143675512.

The previous prime is 1261241197553. The next prime is 1261241197583. The reversal of 1261241197573 is 3757911421621.

It is a de Polignac number, because none of the positive numbers 2^k-1261241197573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261241197523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22831753 + ... + 22886926.

It is an arithmetic number, because the mean of its divisors is an integer number (122480343720).

Almost surely, 2^{1261241197573} is an apocalyptic number.

It is an amenable number.

1261241197573 is a deficient number, since it is larger than the sum of its proper divisors (208522927067).

1261241197573 is an equidigital number, since it uses as much as digits as its factorization.

1261241197573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45719256 (or 45719249 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The spelling of 1261241197573 in words is "one trillion, two hundred sixty-one billion, two hundred forty-one million, one hundred ninety-seven thousand, five hundred seventy-three".