1531530901 has 4 divisors (see below), whose sum is σ = 1621620972. Its totient is φ = 1441440832.

The previous prime is 1531530859. The next prime is 1531530907. The reversal of 1531530901 is 1090351351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 915002001 + 616528900 = 30249^2 + 24830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531530901 - 2¹³ = 1531522709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1531530901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531530907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45045010 + ... + 45045043.

It is an arithmetic number, because the mean of its divisors is an integer number (405405243).

Almost surely, 2^1531530901 is an apocalyptic number.

It is an amenable number.

1531530901 is a deficient number, since it is larger than the sum of its proper divisors (90090071).

1531530901 is an equidigital number, since it uses as much as digits as its factorization.

1531530901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90090070.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 1531530901 is about 39134.7786629744. The cubic root of 1531530901 is about 1152.6795490408.

The spelling of 1531530901 in words is "one billion, five hundred thirty-one million, five hundred thirty thousand, nine hundred one".