7149681 has 64 divisors (see below), whose sum is σ = 13977600. Its totient is φ = 3499200.

The previous prime is 7149677. The next prime is 7149691. The reversal of 7149681 is 1869417.

It is not a de Polignac number, because 7149681 - 2² = 7149677 is a prime.

It is a super-2 number, since 2×7149681² = 102235876803522, which contains 22 as substring.

7149681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7149601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39411 + ... + 39591.

It is an arithmetic number, because the mean of its divisors is an integer number (218400).

Almost surely, 2^7149681 is an apocalyptic number.

It is an amenable number.

7149681 is a deficient number, since it is larger than the sum of its proper divisors (6827919).

7149681 is a wasteful number, since it uses less digits than its factorization.

7149681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 221 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 7149681 is about 2673.8887411409. Note that the first 3 decimals coincide. The cubic root of 7149681 is about 192.6469873034.

The spelling of 7149681 in words is "seven million, one hundred forty-nine thousand, six hundred eighty-one".