231221552 has 10 divisors (see below), whose sum is σ = 447991788. Its totient is φ = 115610768.

The previous prime is 231221521. The next prime is 231221561. The reversal of 231221552 is 255122132.

It is a super-2 number, since 2×231221552² = 106926812218577408, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7225658 + ... + 7225689.

Almost surely, 2^231221552 is an apocalyptic number.

It is an amenable number.

231221552 is a deficient number, since it is larger than the sum of its proper divisors (216770236).

231221552 is a wasteful number, since it uses less digits than its factorization.

231221552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14451355 (or 14451349 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 231221552 is about 15205.9709324989. The cubic root of 231221552 is about 613.7753424826.

Adding to 231221552 its reverse (255122132), we get a palindrome (486343684).

The spelling of 231221552 in words is "two hundred thirty-one million, two hundred twenty-one thousand, five hundred fifty-two".