1331852551 has 4 divisors (see below), whose sum is σ = 1332248704. Its totient is φ = 1331456400.

The previous prime is 1331852549. The next prime is 1331852567. The reversal of 1331852551 is 1552581331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1552581331 = 7 ⋅221797333.

It is a cyclic number.

It is not a de Polignac number, because 1331852551 - 2¹ = 1331852549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331852591) 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, 192990 + ... + 199771.

It is an arithmetic number, because the mean of its divisors is an integer number (333062176).

Almost surely, 2^1331852551 is an apocalyptic number.

1331852551 is a deficient number, since it is larger than the sum of its proper divisors (396153).

1331852551 is an equidigital number, since it uses as much as digits as its factorization.

1331852551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396152.

The product of its digits is 18000, while the sum is 34.

The square root of 1331852551 is about 36494.5550870263. Note that the first 3 decimals coincide. The cubic root of 1331852551 is about 1100.2348124064.

The spelling of 1331852551 in words is "one billion, three hundred thirty-one million, eight hundred fifty-two thousand, five hundred fifty-one".