1311021045145 has 32 divisors (see below), whose sum is σ = 1840005192960. Its totient is φ = 877974128640.

The previous prime is 1311021045013. The next prime is 1311021045233. The reversal of 1311021045145 is 5415401201131.

It is a happy number.

It is not a de Polignac number, because 1311021045145 - 2⁹ = 1311021044633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13739761 + ... + 13834849.

It is an arithmetic number, because the mean of its divisors is an integer number (57500162280).

Almost surely, 2^{1311021045145} is an apocalyptic number.

It is an amenable number.

1311021045145 is a deficient number, since it is larger than the sum of its proper divisors (528984147815).

1311021045145 is an equidigital number, since it uses as much as digits as its factorization.

1311021045145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104305.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 1311021045145 its reverse (5415401201131), we get a palindrome (6726422246276).

The spelling of 1311021045145 in words is "one trillion, three hundred eleven billion, twenty-one million, forty-five thousand, one hundred forty-five".