1512135421 has 4 divisors (see below), whose sum is σ = 1540666332. Its totient is φ = 1483604512.

The previous prime is 1512135413. The next prime is 1512135439. The reversal of 1512135421 is 1245312151.

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 420824196 + 1091311225 = 20514^2 + 33035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1512135421 - 2³ = 1512135413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1512132421) 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, 14265376 + ... + 14265481.

It is an arithmetic number, because the mean of its divisors is an integer number (385166583).

Almost surely, 2^1512135421 is an apocalyptic number.

It is an amenable number.

1512135421 is a deficient number, since it is larger than the sum of its proper divisors (28530911).

1512135421 is an equidigital number, since it uses as much as digits as its factorization.

1512135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28530910.

The product of its digits is 1200, while the sum is 25.

The square root of 1512135421 is about 38886.1854776217. The cubic root of 1512135421 is about 1147.7929746529.

Adding to 1512135421 its reverse (1245312151), we get a palindrome (2757447572).

The spelling of 1512135421 in words is "one billion, five hundred twelve million, one hundred thirty-five thousand, four hundred twenty-one".