1311421531601 has 4 divisors (see below), whose sum is σ = 1311597356400. Its totient is φ = 1311245706804.

The previous prime is 1311421531577. The next prime is 1311421531619. The reversal of 1311421531601 is 1061351241131.

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 1311421531601 - 2¹⁰ = 1311421530577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311421531661) 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, 87901211 + ... + 87916128.

It is an arithmetic number, because the mean of its divisors is an integer number (327899339100).

Almost surely, 2^{1311421531601} is an apocalyptic number.

It is an amenable number.

1311421531601 is a deficient number, since it is larger than the sum of its proper divisors (175824799).

1311421531601 is an equidigital number, since it uses as much as digits as its factorization.

1311421531601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175824798.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 1311421531601 its reverse (1061351241131), we get a palindrome (2372772772732).

The spelling of 1311421531601 in words is "one trillion, three hundred eleven billion, four hundred twenty-one million, five hundred thirty-one thousand, six hundred one".