7155641 has 4 divisors (see below), whose sum is σ = 7178532. Its totient is φ = 7132752.

The previous prime is 7155611. The next prime is 7155649. The reversal of 7155641 is 1465517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1465517 = 373 ⋅3929.

It can be written as a sum of positive squares in 2 ways, for example, as 395641 + 6760000 = 629^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7155641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7155649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10970 + ... + 11603.

It is an arithmetic number, because the mean of its divisors is an integer number (1794633).

Almost surely, 2^7155641 is an apocalyptic number.

It is an amenable number.

7155641 is a deficient number, since it is larger than the sum of its proper divisors (22891).

7155641 is a wasteful number, since it uses less digits than its factorization.

7155641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22890.

The product of its digits is 4200, while the sum is 29.

The square root of 7155641 is about 2675.0029906525. The cubic root of 7155641 is about 192.7005028449.

The spelling of 7155641 in words is "seven million, one hundred fifty-five thousand, six hundred forty-one".