1531623241 has 2 divisors, whose sum is σ = 1531623242. Its totient is φ = 1531623240.

The previous prime is 1531623239. The next prime is 1531623257. The reversal of 1531623241 is 1423261351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1472947641 + 58675600 = 38379^2 + 7660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531623241 - 2¹ = 1531623239 is a prime.

Together with 1531623239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1531623271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765811620 + 765811621.

It is an arithmetic number, because the mean of its divisors is an integer number (765811621).

Almost surely, 2^1531623241 is an apocalyptic number.

It is an amenable number.

1531623241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531623241 is an equidigital number, since it uses as much as digits as its factorization.

1531623241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 1531623241 is about 39135.9584142257. The cubic root of 1531623241 is about 1152.7027145959.

Adding to 1531623241 its reverse (1423261351), we get a palindrome (2954884592).

The spelling of 1531623241 in words is "one billion, five hundred thirty-one million, six hundred twenty-three thousand, two hundred forty-one".