7491321 has 6 divisors (see below), whose sum is σ = 10820810. Its totient is φ = 4994208.

The previous prime is 7491313. The next prime is 7491343. The reversal of 7491321 is 1231947.

It can be written as a sum of positive squares in only one way, i.e., 7485696 + 5625 = 2736^2 + 75^2 .

It is not a de Polignac number, because 7491321 - 2³ = 7491313 is a prime.

It is a super-2 number, since 2×7491321² = 112239780650082, which contains 22 as substring.

It is a Duffinian number.

7491321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7491311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 416176 + ... + 416193.

Almost surely, 2^7491321 is an apocalyptic number.

It is an amenable number.

7491321 is a deficient number, since it is larger than the sum of its proper divisors (3329489).

7491321 is a wasteful number, since it uses less digits than its factorization.

7491321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832375 (or 832372 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 7491321 is about 2737.0277674879. The cubic root of 7491321 is about 195.6678481678.

The spelling of 7491321 in words is "seven million, four hundred ninety-one thousand, three hundred twenty-one".