9271421 has 2 divisors, whose sum is σ = 9271422. Its totient is φ = 9271420.

The previous prime is 9271403. The next prime is 9271429. The reversal of 9271421 is 1241729.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5808100 + 3463321 = 2410^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 9271421 - 2¹⁰ = 9270397 is a prime.

It is a super-3 number, since 3×9271421³ (a number of 22 digits) contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9271429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4635710 + 4635711.

It is an arithmetic number, because the mean of its divisors is an integer number (4635711).

Almost surely, 2^9271421 is an apocalyptic number.

It is an amenable number.

9271421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9271421 is an equidigital number, since it uses as much as digits as its factorization.

9271421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 9271421 is about 3044.9008194028. The cubic root of 9271421 is about 210.0787384254.

The spelling of 9271421 in words is "nine million, two hundred seventy-one thousand, four hundred twenty-one".