1311254221451 has 4 divisors (see below), whose sum is σ = 1313299860504. Its totient is φ = 1309208582400.

The previous prime is 1311254221447. The next prime is 1311254221531. The reversal of 1311254221451 is 1541224521131.

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 1311254221451 - 2² = 1311254221447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311254221351) 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, 1022818565 + ... + 1022819846.

It is an arithmetic number, because the mean of its divisors is an integer number (328324965126).

Almost surely, 2^{1311254221451} is an apocalyptic number.

1311254221451 is a deficient number, since it is larger than the sum of its proper divisors (2045639053).

1311254221451 is an equidigital number, since it uses as much as digits as its factorization.

1311254221451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045639052.

The product of its digits is 9600, while the sum is 32.

Adding to 1311254221451 its reverse (1541224521131), we get a palindrome (2852478742582).

The spelling of 1311254221451 in words is "one trillion, three hundred eleven billion, two hundred fifty-four million, two hundred twenty-one thousand, four hundred fifty-one".