1201423521 has 8 divisors (see below), whose sum is σ = 1602669600. Its totient is φ = 800563232.

The previous prime is 1201423501. The next prime is 1201423529. The reversal of 1201423521 is 1253241021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201423521 - 2¹⁵ = 1201390753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201423529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89100 + ... + 101693.

It is an arithmetic number, because the mean of its divisors is an integer number (200333700).

Almost surely, 2^1201423521 is an apocalyptic number.

It is an amenable number.

1201423521 is a deficient number, since it is larger than the sum of its proper divisors (401246079).

1201423521 is a wasteful number, since it uses less digits than its factorization.

1201423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192895.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1201423521 is about 34661.5568173156. The cubic root of 1201423521 is about 1063.0786022439.

Adding to 1201423521 its reverse (1253241021), we get a palindrome (2454664542).

The spelling of 1201423521 in words is "one billion, two hundred one million, four hundred twenty-three thousand, five hundred twenty-one".