1261044937153 has 4 divisors (see below), whose sum is σ = 1284838237908. Its totient is φ = 1237251636400.

The previous prime is 1261044937129. The next prime is 1261044937183. The reversal of 1261044937153 is 3517394401621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1089576893584 + 171468043569 = 1043828^2 + 414087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261044937153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261044937183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11896650298 + ... + 11896650403.

It is an arithmetic number, because the mean of its divisors is an integer number (321209559477).

Almost surely, 2^{1261044937153} is an apocalyptic number.

It is an amenable number.

1261044937153 is a deficient number, since it is larger than the sum of its proper divisors (23793300755).

1261044937153 is an equidigital number, since it uses as much as digits as its factorization.

1261044937153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23793300754.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 1261044937153 in words is "one trillion, two hundred sixty-one billion, forty-four million, nine hundred thirty-seven thousand, one hundred fifty-three".