6521994 has 12 divisors (see below), whose sum is σ = 14131026. Its totient is φ = 2173992.

The previous prime is 6521987. The next prime is 6522001. The reversal of 6521994 is 4991256.

It is an interprime number because it is at equal distance from previous prime (6521987) and next prime (6522001).

It can be written as a sum of positive squares in only one way, i.e., 6066369 + 455625 = 2463^2 + 675^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181149 + ... + 181184.

Almost surely, 2^6521994 is an apocalyptic number.

6521994 is an abundant number, since it is smaller than the sum of its proper divisors (7609032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6521994 is a wasteful number, since it uses less digits than its factorization.

6521994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362341 (or 362338 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 6521994 is about 2553.8194924466. The cubic root of 6521994 is about 186.8358153581.

The spelling of 6521994 in words is "six million, five hundred twenty-one thousand, nine hundred ninety-four".