1231345315601 has 4 divisors (see below), whose sum is σ = 1231349325492. Its totient is φ = 1231341305712.

The previous prime is 1231345315559. The next prime is 1231345315621. The reversal of 1231345315601 is 1065135431321.

It is a Cunningham number, because it is equal to 1109660²+1.

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 43190814976 + 1188154500625 = 207824^2 + 1090025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231345315601 - 2¹⁸ = 1231345053457 is a prime.

It is a super-2 number, since 2×1231345315601² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231345315621) 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, 1502330 + ... + 2172483.

It is an arithmetic number, because the mean of its divisors is an integer number (307837331373).

Almost surely, 2^{1231345315601} is an apocalyptic number.

It is an amenable number.

1231345315601 is a deficient number, since it is larger than the sum of its proper divisors (4009891).

1231345315601 is an equidigital number, since it uses as much as digits as its factorization.

1231345315601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009890.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 1231345315601 in words is "one trillion, two hundred thirty-one billion, three hundred forty-five million, three hundred fifteen thousand, six hundred one".