1531590481 has 2 divisors, whose sum is σ = 1531590482. Its totient is φ = 1531590480.

The previous prime is 1531590413. The next prime is 1531590491. The reversal of 1531590481 is 1840951351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1144130625 + 387459856 = 33825^2 + 19684^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531590481 - 2⁷ = 1531590353 is a prime.

It is a super-2 number, since 2×1531590481² = 4691538802979622722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1531590481.

It is not a weakly prime, because it can be changed into another prime (1531590491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765795240 + 765795241.

It is an arithmetic number, because the mean of its divisors is an integer number (765795241).

Almost surely, 2^1531590481 is an apocalyptic number.

It is an amenable number.

1531590481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531590481 is an equidigital number, since it uses as much as digits as its factorization.

1531590481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 1531590481 is about 39135.5398710686. The cubic root of 1531590481 is about 1152.6944961235.

The spelling of 1531590481 in words is "one billion, five hundred thirty-one million, five hundred ninety thousand, four hundred eighty-one".