1535231213 has 4 divisors (see below), whose sum is σ = 1536240768. Its totient is φ = 1534221660.

The previous prime is 1535231177. The next prime is 1535231239. The reversal of 1535231213 is 3121325351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1535231213 - 2¹⁶ = 1535165677 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 (1535231263) 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, 502493 + ... + 505538.

It is an arithmetic number, because the mean of its divisors is an integer number (384060192).

Almost surely, 2^1535231213 is an apocalyptic number.

It is an amenable number.

1535231213 is a deficient number, since it is larger than the sum of its proper divisors (1009555).

1535231213 is a wasteful number, since it uses less digits than its factorization.

1535231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009554.

The product of its digits is 2700, while the sum is 26.

The square root of 1535231213 is about 39182.0266576399. The cubic root of 1535231213 is about 1153.6071271212.

Adding to 1535231213 its reverse (3121325351), we get a palindrome (4656556564).

The spelling of 1535231213 in words is "one billion, five hundred thirty-five million, two hundred thirty-one thousand, two hundred thirteen".