1215488399731 has 2 divisors, whose sum is σ = 1215488399732. Its totient is φ = 1215488399730.

The previous prime is 1215488399707. The next prime is 1215488399777. The reversal of 1215488399731 is 1379938845121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1379938845121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215488399731 - 2¹³ = 1215488391539 is a prime.

It is a super-2 number, since 2×1215488399731² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1215488399731.

It is not a weakly prime, because it can be changed into another prime (1215488399131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607744199865 + 607744199866.

It is an arithmetic number, because the mean of its divisors is an integer number (607744199866).

Almost surely, 2^{1215488399731} is an apocalyptic number.

1215488399731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215488399731 is an equidigital number, since it uses as much as digits as its factorization.

1215488399731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 61.

The spelling of 1215488399731 in words is "one trillion, two hundred fifteen billion, four hundred eighty-eight million, three hundred ninety-nine thousand, seven hundred thirty-one".