291011720486401 has 4 divisors (see below), whose sum is σ = 292865298324052. Its totient is φ = 289158142648752.

The previous prime is 291011720486387. The next prime is 291011720486419. The reversal of 291011720486401 is 104684027110192.

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 93697753657600 + 197313966828801 = 9679760^2 + 14046849^2 .

It is a cyclic number.

It is not a de Polignac number, because 291011720486401 - 2¹³ = 291011720478209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291011720486491) 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, 926788918590 + ... + 926788918903.

It is an arithmetic number, because the mean of its divisors is an integer number (73216324581013).

Almost surely, 2^{291011720486401} is an apocalyptic number.

It is an amenable number.

291011720486401 is a deficient number, since it is larger than the sum of its proper divisors (1853577837651).

291011720486401 is a wasteful number, since it uses less digits than its factorization.

291011720486401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853577837650.

The product of its (nonzero) digits is 193536, while the sum is 46.

Adding to 291011720486401 its reverse (104684027110192), we get a palindrome (395695747596593).

The spelling of 291011720486401 in words is "two hundred ninety-one trillion, eleven billion, seven hundred twenty million, four hundred eighty-six thousand, four hundred one".