1553213231 has 4 divisors (see below), whose sum is σ = 1554753600. Its totient is φ = 1551672864.

The previous prime is 1553213219. The next prime is 1553213237. The reversal of 1553213231 is 1323123551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1553213231 - 2¹⁴ = 1553196847 is a prime.

It is a super-2 number, since 2×1553213231² = 4824942681906918722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1553213231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553213237) 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, 768671 + ... + 770688.

It is an arithmetic number, because the mean of its divisors is an integer number (388688400).

Almost surely, 2^1553213231 is an apocalyptic number.

1553213231 is a deficient number, since it is larger than the sum of its proper divisors (1540369).

1553213231 is a wasteful number, since it uses less digits than its factorization.

1553213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540368.

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

The square root of 1553213231 is about 39410.8263171429. The cubic root of 1553213231 is about 1158.0936859622.

Adding to 1553213231 its reverse (1323123551), we get a palindrome (2876336782).

The spelling of 1553213231 in words is "one billion, five hundred fifty-three million, two hundred thirteen thousand, two hundred thirty-one".