6435087961 has 9 divisors (see below), whose sum is σ = 6509984799. Its totient is φ = 6361045824.

The previous prime is 6435087949. The next prime is 6435087977. The reversal of 6435087961 is 1697805346.

The square root of 6435087961 is 80219.

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

It can be written as a sum of positive squares in only one way, i.e., 2889600025 + 3545487936 = 53755^2 + 59544^2 .

It is not a de Polignac number, because 6435087961 - 2⁷ = 6435087833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6435087991) 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, 7780830 + ... + 7781656.

Almost surely, 2^6435087961 is an apocalyptic number.

6435087961 is the 80219-th square number.

6435087961 is the 40110-th centered octagonal number.

It is an amenable number.

6435087961 is a deficient number, since it is larger than the sum of its proper divisors (74896838).

6435087961 is an frugal number, since it uses more digits than its factorization.

6435087961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The cubic root of 6435087961 is about 1860.0223492324.

Multiplying 6435087961 by its sum of digits (49), we get a square (315319310089 = 561533²).

The spelling of 6435087961 in words is "six billion, four hundred thirty-five million, eighty-seven thousand, nine hundred sixty-one".