1311620561545 has 32 divisors (see below), whose sum is σ = 1891853936640. Its totient is φ = 853961771520.

The previous prime is 1311620561533. The next prime is 1311620561557. The reversal of 1311620561545 is 5451650261131.

It is an interprime number because it is at equal distance from previous prime (1311620561533) and next prime (1311620561557).

It is not a de Polignac number, because 1311620561545 - 2⁵ = 1311620561513 is a prime.

It is a super-3 number, since 3×1311620561545³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1311620561498 and 1311620561507.

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, 11346900 + ... + 11461909.

It is an arithmetic number, because the mean of its divisors is an integer number (59120435520).

Almost surely, 2^{1311620561545} is an apocalyptic number.

It is an amenable number.

1311620561545 is a deficient number, since it is larger than the sum of its proper divisors (580233375095).

1311620561545 is a wasteful number, since it uses less digits than its factorization.

1311620561545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22808905.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 1311620561545 in words is "one trillion, three hundred eleven billion, six hundred twenty million, five hundred sixty-one thousand, five hundred forty-five".