7158661 has 4 divisors (see below), whose sum is σ = 7211052. Its totient is φ = 7106272.

The previous prime is 7158659. The next prime is 7158673. The reversal of 7158661 is 1668517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3218436 + 3940225 = 1794^2 + 1985^2 .

It is a cyclic number.

It is not a de Polignac number, because 7158661 - 2¹ = 7158659 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7158631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25990 + ... + 26263.

It is an arithmetic number, because the mean of its divisors is an integer number (1802763).

Almost surely, 2^7158661 is an apocalyptic number.

It is an amenable number.

7158661 is a deficient number, since it is larger than the sum of its proper divisors (52391).

7158661 is a wasteful number, since it uses less digits than its factorization.

7158661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52390.

The product of its digits is 10080, while the sum is 34.

The square root of 7158661 is about 2675.5674164558. The cubic root of 7158661 is about 192.7276084374.

The spelling of 7158661 in words is "seven million, one hundred fifty-eight thousand, six hundred sixty-one".