1531139473 has 2 divisors, whose sum is σ = 1531139474. Its totient is φ = 1531139472.

The previous prime is 1531139461. The next prime is 1531139483. The reversal of 1531139473 is 3749311351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975500289 + 555639184 = 31233^2 + 23572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531139473 - 2¹³ = 1531131281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531139413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765569736 + 765569737.

It is an arithmetic number, because the mean of its divisors is an integer number (765569737).

Almost surely, 2^1531139473 is an apocalyptic number.

It is an amenable number.

1531139473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531139473 is an equidigital number, since it uses as much as digits as its factorization.

1531139473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 37.

The square root of 1531139473 is about 39129.7773185588. Note that the first 3 decimals coincide. The cubic root of 1531139473 is about 1152.5813402280.

The spelling of 1531139473 in words is "one billion, five hundred thirty-one million, one hundred thirty-nine thousand, four hundred seventy-three".