1315747421537 has 2 divisors, whose sum is σ = 1315747421538. Its totient is φ = 1315747421536.

The previous prime is 1315747421419. The next prime is 1315747421561. The reversal of 1315747421537 is 7351247475131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267788173521 + 47959248016 = 1125961^2 + 218996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315747421537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315747481537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657873710768 + 657873710769.

It is an arithmetic number, because the mean of its divisors is an integer number (657873710769).

Almost surely, 2^{1315747421537} is an apocalyptic number.

It is an amenable number.

1315747421537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315747421537 is an equidigital number, since it uses as much as digits as its factorization.

1315747421537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469600, while the sum is 50.

The spelling of 1315747421537 in words is "one trillion, three hundred fifteen billion, seven hundred forty-seven million, four hundred twenty-one thousand, five hundred thirty-seven".