1531540018 has 12 divisors (see below), whose sum is σ = 2303001018. Its totient is φ = 763875840.

The previous prime is 1531539983. The next prime is 1531540039. The reversal of 1531540018 is 8100451351.

It can be written as a sum of positive squares in 3 ways, for example, as 1172172169 + 359367849 = 34237^2 + 18957^2 .

It is a super-2 number, since 2×1531540018² = 4691229653470880648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1400680 + ... + 1401772.

Almost surely, 2^1531540018 is an apocalyptic number.

1531540018 is a deficient number, since it is larger than the sum of its proper divisors (771461000).

1531540018 is an frugal number, since it uses more digits than its factorization.

1531540018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2829 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 1531540018 is about 39134.8951448704. The cubic root of 1531540018 is about 1152.6818362857.

Adding to 1531540018 its reverse (8100451351), we get a palindrome (9631991369).

The spelling of 1531540018 in words is "one billion, five hundred thirty-one million, five hundred forty thousand, eighteen".