8521371437 has 4 divisors (see below), whose sum is σ = 8555321376. Its totient is φ = 8487421500.

The previous prime is 8521371409. The next prime is 8521371449. The reversal of 8521371437 is 7341731258.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7341731258 = 2 ⋅3670865629.

It is a cyclic number.

It is not a de Polignac number, because 8521371437 - 2²⁰ = 8520322861 is a prime.

It is a super-2 number, since 2×8521371437² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8521371394 and 8521371403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521371457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16974593 + ... + 16975094.

It is an arithmetic number, because the mean of its divisors is an integer number (2138830344).

Almost surely, 2^8521371437 is an apocalyptic number.

It is an amenable number.

8521371437 is a deficient number, since it is larger than the sum of its proper divisors (33949939).

8521371437 is a wasteful number, since it uses less digits than its factorization.

8521371437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33949938.

The product of its digits is 141120, while the sum is 41.

The square root of 8521371437 is about 92311.2747014145. The cubic root of 8521371437 is about 2042.5365279986.

The spelling of 8521371437 in words is "eight billion, five hundred twenty-one million, three hundred seventy-one thousand, four hundred thirty-seven".