7121145 has 16 divisors (see below), whose sum is σ = 11889792. Its totient is φ = 3632640.

The previous prime is 7121141. The next prime is 7121161. The reversal of 7121145 is 5411217.

It is a happy number.

It is not a de Polignac number, because 7121145 - 2² = 7121141 is a prime.

It is a super-2 number, since 2×7121145² = 101421412222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7121141) 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 15 ways as a sum of consecutive naturals, for example, 9976 + ... + 10665.

It is an arithmetic number, because the mean of its divisors is an integer number (743112).

Almost surely, 2^7121145 is an apocalyptic number.

It is an amenable number.

7121145 is a deficient number, since it is larger than the sum of its proper divisors (4768647).

7121145 is a wasteful number, since it uses less digits than its factorization.

7121145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20672.

The product of its digits is 280, while the sum is 21.

The square root of 7121145 is about 2668.5473576461. The cubic root of 7121145 is about 192.3903462753.

The spelling of 7121145 in words is "seven million, one hundred twenty-one thousand, one hundred forty-five".