1371887521 has 3 divisors (see below), whose sum is σ = 1371924561. Its totient is φ = 1371850482.

The previous prime is 1371887507. The next prime is 1371887527. The reversal of 1371887521 is 1257881731.

The square root of 1371887521 is 37039.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1371887521 - 2¹³ = 1371879329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1371887527) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18520 + ... + 55558.

It is an arithmetic number, because the mean of its divisors is an integer number (457308187).

Almost surely, 2^1371887521 is an apocalyptic number.

1371887521 is the 37039-th square number.

1371887521 is the 18520-th centered octagonal number.

It is an amenable number.

1371887521 is a deficient number, since it is larger than the sum of its proper divisors (37040).

1371887521 is an frugal number, since it uses more digits than its factorization.

1371887521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74078 (or 37039 counting only the distinct ones).

The product of its digits is 94080, while the sum is 43.

The cubic root of 1371887521 is about 1111.1503700236.

The spelling of 1371887521 in words is "one billion, three hundred seventy-one million, eight hundred eighty-seven thousand, five hundred twenty-one".