231153421 has 2 divisors, whose sum is σ = 231153422. Its totient is φ = 231153420.

The previous prime is 231153409. The next prime is 231153451. The reversal of 231153421 is 124351132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220849321 + 10304100 = 14861^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 231153421 - 2⁵ = 231153389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231153392 and 231153401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231153401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115576710 + 115576711.

It is an arithmetic number, because the mean of its divisors is an integer number (115576711).

Almost surely, 2^231153421 is an apocalyptic number.

It is an amenable number.

231153421 is a deficient number, since it is larger than the sum of its proper divisors (1).

231153421 is an equidigital number, since it uses as much as digits as its factorization.

231153421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 231153421 is about 15203.7304961644. The cubic root of 231153421 is about 613.7150522035.

The spelling of 231153421 in words is "two hundred thirty-one million, one hundred fifty-three thousand, four hundred twenty-one".