153031421 has 4 divisors (see below), whose sum is σ = 153627132. Its totient is φ = 152435712.

The previous prime is 153031391. The next prime is 153031423. The reversal of 153031421 is 124130351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70476025 + 82555396 = 8395^2 + 9086^2 .

It is a cyclic number.

It is not a de Polignac number, because 153031421 - 2⁶ = 153031357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 153031393 and 153031402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153031423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297470 + ... + 297983.

It is an arithmetic number, because the mean of its divisors is an integer number (38406783).

Almost surely, 2^153031421 is an apocalyptic number.

It is an amenable number.

153031421 is a deficient number, since it is larger than the sum of its proper divisors (595711).

153031421 is an equidigital number, since it uses as much as digits as its factorization.

153031421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595710.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 153031421 is about 12370.5869302956. The cubic root of 153031421 is about 534.8847348268.

Adding to 153031421 its reverse (124130351), we get a palindrome (277161772).

The spelling of 153031421 in words is "one hundred fifty-three million, thirty-one thousand, four hundred twenty-one".