1261462200991 has 4 divisors (see below), whose sum is σ = 1261464463672. Its totient is φ = 1261459938312.

The previous prime is 1261462200941. The next prime is 1261462201003. The reversal of 1261462200991 is 1990022641621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261462200991 - 2⁷ = 1261462200863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261462200941) 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 3 ways as a sum of consecutive naturals, for example, 361825 + ... + 1629061.

It is an arithmetic number, because the mean of its divisors is an integer number (315366115918).

Almost surely, 2^{1261462200991} is an apocalyptic number.

1261462200991 is a deficient number, since it is larger than the sum of its proper divisors (2262681).

1261462200991 is an equidigital number, since it uses as much as digits as its factorization.

1261462200991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262680.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 1261462200991 in words is "one trillion, two hundred sixty-one billion, four hundred sixty-two million, two hundred thousand, nine hundred ninety-one".