7153921 has 2 divisors, whose sum is σ = 7153922. Its totient is φ = 7153920.

The previous prime is 7153891. The next prime is 7153961. The reversal of 7153921 is 1293517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3783025 + 3370896 = 1945^2 + 1836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7153921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7153921.

It is not a weakly prime, because it can be changed into another prime (7153961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3576960 + 3576961.

It is an arithmetic number, because the mean of its divisors is an integer number (3576961).

Almost surely, 2^7153921 is an apocalyptic number.

It is an amenable number.

7153921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7153921 is an equidigital number, since it uses as much as digits as its factorization.

7153921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 28.

The square root of 7153921 is about 2674.6814763631. The cubic root of 7153921 is about 192.6850618138.

The spelling of 7153921 in words is "seven million, one hundred fifty-three thousand, nine hundred twenty-one".