1513531993 has 2 divisors, whose sum is σ = 1513531994. Its totient is φ = 1513531992.

The previous prime is 1513531991. The next prime is 1513532047. The reversal of 1513531993 is 3991353151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191078144 + 322453849 = 34512^2 + 17957^2 .

It is a cyclic number.

It is not a de Polignac number, because 1513531993 - 2¹ = 1513531991 is a prime.

Together with 1513531991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1513531991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756765996 + 756765997.

It is an arithmetic number, because the mean of its divisors is an integer number (756765997).

Almost surely, 2^1513531993 is an apocalyptic number.

It is an amenable number.

1513531993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1513531993 is an equidigital number, since it uses as much as digits as its factorization.

1513531993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54675, while the sum is 40.

The square root of 1513531993 is about 38904.1385073619. The cubic root of 1513531993 is about 1148.1462239433.

The spelling of 1513531993 in words is "one billion, five hundred thirteen million, five hundred thirty-one thousand, nine hundred ninety-three".