1201291779271 has 4 divisors (see below), whose sum is σ = 1201821218200. Its totient is φ = 1200762340344.

The previous prime is 1201291779251. The next prime is 1201291779307. The reversal of 1201291779271 is 1729771921021.

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 1201291779271 - 2¹⁹ = 1201291254983 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 (1201291779251) 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, 264716061 + ... + 264720598.

It is an arithmetic number, because the mean of its divisors is an integer number (300455304550).

Almost surely, 2^{1201291779271} is an apocalyptic number.

1201291779271 is a deficient number, since it is larger than the sum of its proper divisors (529438929).

1201291779271 is an equidigital number, since it uses as much as digits as its factorization.

1201291779271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529438928.

The product of its (nonzero) digits is 222264, while the sum is 49.

The spelling of 1201291779271 in words is "one trillion, two hundred one billion, two hundred ninety-one million, seven hundred seventy-nine thousand, two hundred seventy-one".