1531952509 has 2 divisors, whose sum is σ = 1531952510. Its totient is φ = 1531952508.

The previous prime is 1531952507. The next prime is 1531952537. The reversal of 1531952509 is 9052591351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359765625 + 172186884 = 36875^2 + 13122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531952509 - 2¹ = 1531952507 is a prime.

Together with 1531952507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531952503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765976254 + 765976255.

It is an arithmetic number, because the mean of its divisors is an integer number (765976255).

Almost surely, 2^1531952509 is an apocalyptic number.

It is an amenable number.

1531952509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531952509 is an equidigital number, since it uses as much as digits as its factorization.

1531952509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 1531952509 is about 39140.1649076751. The cubic root of 1531952509 is about 1152.7853112624.

The spelling of 1531952509 in words is "one billion, five hundred thirty-one million, nine hundred fifty-two thousand, five hundred nine".