1423521257 has 4 divisors (see below), whose sum is σ = 1423604820. Its totient is φ = 1423437696.

The previous prime is 1423521233. The next prime is 1423521293. The reversal of 1423521257 is 7521253241.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 973190416 + 450330841 = 31196^2 + 21221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423521257 - 2³⁰ = 349779433 is a prime.

It is a super-3 number, since 3×1423521257³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1423521157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6032 + ... + 53697.

It is an arithmetic number, because the mean of its divisors is an integer number (355901205).

Almost surely, 2^1423521257 is an apocalyptic number.

It is an amenable number.

1423521257 is a deficient number, since it is larger than the sum of its proper divisors (83563).

1423521257 is an equidigital number, since it uses as much as digits as its factorization.

1423521257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83562.

The product of its digits is 16800, while the sum is 32.

The square root of 1423521257 is about 37729.5806629228. The cubic root of 1423521257 is about 1124.9191729914.

Adding to 1423521257 its reverse (7521253241), we get a palindrome (8944774498).

The spelling of 1423521257 in words is "one billion, four hundred twenty-three million, five hundred twenty-one thousand, two hundred fifty-seven".