1513222121987 has 2 divisors, whose sum is σ = 1513222121988. Its totient is φ = 1513222121986.

The previous prime is 1513222121969. The next prime is 1513222122031. The reversal of 1513222121987 is 7891212223151.

It is an a-pointer prime, because the next prime (1513222122031) can be obtained adding 1513222121987 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1513222121987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1513222121087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756611060993 + 756611060994.

It is an arithmetic number, because the mean of its divisors is an integer number (756611060994).

Almost surely, 2^{1513222121987} is an apocalyptic number.

1513222121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1513222121987 is an equidigital number, since it uses as much as digits as its factorization.

1513222121987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The spelling of 1513222121987 in words is "one trillion, five hundred thirteen billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred eighty-seven".