1331521053 has 4 divisors (see below), whose sum is σ = 1775361408. Its totient is φ = 887680700.

The previous prime is 1331521033. The next prime is 1331521091. The reversal of 1331521053 is 3501251331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1331521053 - 2⁶ = 1331520989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331521033) 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, 221920173 + ... + 221920178.

It is an arithmetic number, because the mean of its divisors is an integer number (443840352).

Almost surely, 2^1331521053 is an apocalyptic number.

It is an amenable number.

1331521053 is a deficient number, since it is larger than the sum of its proper divisors (443840355).

1331521053 is an equidigital number, since it uses as much as digits as its factorization.

1331521053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443840354.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 1331521053 is about 36490.0130583698. The cubic root of 1331521053 is about 1100.1435220446.

Adding to 1331521053 its reverse (3501251331), we get a palindrome (4832772384).

The spelling of 1331521053 in words is "one billion, three hundred thirty-one million, five hundred twenty-one thousand, fifty-three".