1331421525 has 36 divisors (see below), whose sum is σ = 2725401952. Its totient is φ = 608649120.

The previous prime is 1331421517. The next prime is 1331421527. The reversal of 1331421525 is 5251241331.

1331421525 is a `hidden beast` number, since 133 + 1 + 4 + 2 + 1 + 525 = 666.

It is not a de Polignac number, because 1331421525 - 2³ = 1331421517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331421527) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 421099 + ... + 424248.

Almost surely, 2^1331421525 is an apocalyptic number.

1331421525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331421525 is an abundant number, since it is smaller than the sum of its proper divisors (1393980427).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331421525 is a wasteful number, since it uses less digits than its factorization.

1331421525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845370 (or 845362 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1331421525 is about 36488.6492624761. The cubic root of 1331421525 is about 1100.1161103331.

Adding to 1331421525 its reverse (5251241331), we get a palindrome (6582662856).

The spelling of 1331421525 in words is "one billion, three hundred thirty-one million, four hundred twenty-one thousand, five hundred twenty-five".