153391421 has 4 divisors (see below), whose sum is σ = 153733500. Its totient is φ = 153049344.

The previous prime is 153391397. The next prime is 153391423. The reversal of 153391421 is 124193351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124193351 = 587 ⋅211573.

It can be written as a sum of positive squares in 2 ways, for example, as 40819321 + 112572100 = 6389^2 + 10610^2 .

It is a cyclic number.

It is not a de Polignac number, because 153391421 - 2¹⁰ = 153390397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153391423) 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, 170366 + ... + 171263.

It is an arithmetic number, because the mean of its divisors is an integer number (38433375).

Almost surely, 2^153391421 is an apocalyptic number.

It is an amenable number.

153391421 is a deficient number, since it is larger than the sum of its proper divisors (342079).

153391421 is an equidigital number, since it uses as much as digits as its factorization.

153391421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342078.

The product of its digits is 3240, while the sum is 29.

The square root of 153391421 is about 12385.1290263768. The cubic root of 153391421 is about 535.3038376599.

The spelling of 153391421 in words is "one hundred fifty-three million, three hundred ninety-one thousand, four hundred twenty-one".