8261537449 has 9 divisors (see below), whose sum is σ = 9081962589. Its totient is φ = 7509579660.

The previous prime is 8261537437. The next prime is 8261537467. The reversal of 8261537449 is 9447351628.

It is a happy number.

The square root of 8261537449 is 90893.

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

It is not a de Polignac number, because 8261537449 - 2⁷ = 8261537321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8261537149) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 995692 + ... + 1003954.

Almost surely, 2^8261537449 is an apocalyptic number.

8261537449 is the 90893-rd square number.

8261537449 is the 45447-th centered octagonal number.

It is an amenable number.

8261537449 is a deficient number, since it is larger than the sum of its proper divisors (820425140).

8261537449 is an frugal number, since it uses more digits than its factorization.

8261537449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16548 (or 8274 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The cubic root of 8261537449 is about 2021.5615028876.

Multiplying 8261537449 by its sum of digits (49), we get a square (404815335001 = 636251²).

The spelling of 8261537449 in words is "eight billion, two hundred sixty-one million, five hundred thirty-seven thousand, four hundred forty-nine".