1538530913 has 2 divisors, whose sum is σ = 1538530914. Its totient is φ = 1538530912.

The previous prime is 1538530897. The next prime is 1538530933. The reversal of 1538530913 is 3190358351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1481634064 + 56896849 = 38492^2 + 7543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538530913 - 2⁴ = 1538530897 is a prime.

It is a super-2 number, since 2×1538530913² = 4734154740513227138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1538530933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769265456 + 769265457.

It is an arithmetic number, because the mean of its divisors is an integer number (769265457).

Almost surely, 2^1538530913 is an apocalyptic number.

It is an amenable number.

1538530913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538530913 is an equidigital number, since it uses as much as digits as its factorization.

1538530913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 1538530913 is about 39224.1113729808. Note that the first 3 decimals coincide. The cubic root of 1538530913 is about 1154.4330251986.

The spelling of 1538530913 in words is "one billion, five hundred thirty-eight million, five hundred thirty thousand, nine hundred thirteen".