1291291942461 has 4 divisors (see below), whose sum is σ = 1721722589952. Its totient is φ = 860861294972.

The previous prime is 1291291942441. The next prime is 1291291942477. The reversal of 1291291942461 is 1642491921921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1291291942461 - 2¹⁹ = 1291291418173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291291942441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215215323741 + ... + 215215323746.

It is an arithmetic number, because the mean of its divisors is an integer number (430430647488).

Almost surely, 2^{1291291942461} is an apocalyptic number.

It is an amenable number.

1291291942461 is a deficient number, since it is larger than the sum of its proper divisors (430430647491).

1291291942461 is an equidigital number, since it uses as much as digits as its factorization.

1291291942461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430430647490.

The product of its digits is 559872, while the sum is 51.

The spelling of 1291291942461 in words is "one trillion, two hundred ninety-one billion, two hundred ninety-one million, nine hundred forty-two thousand, four hundred sixty-one".