7161989 has 4 divisors (see below), whose sum is σ = 7201740. Its totient is φ = 7122240.

The previous prime is 7161971. The next prime is 7161991. The reversal of 7161989 is 9891617.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9891617 = 37 ⋅267341.

It can be written as a sum of positive squares in 2 ways, for example, as 1677025 + 5484964 = 1295^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 7161989 - 2¹² = 7157893 is a prime.

It is a super-2 number, since 2×7161989² = 102588172872242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7161929) 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, 19604 + ... + 19965.

It is an arithmetic number, because the mean of its divisors is an integer number (1800435).

Almost surely, 2^7161989 is an apocalyptic number.

It is an amenable number.

7161989 is a deficient number, since it is larger than the sum of its proper divisors (39751).

7161989 is a wasteful number, since it uses less digits than its factorization.

7161989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39750.

The product of its digits is 27216, while the sum is 41.

The square root of 7161989 is about 2676.1892683441. The cubic root of 7161989 is about 192.7574696136.

The spelling of 7161989 in words is "seven million, one hundred sixty-one thousand, nine hundred eighty-nine".