1023231555 has 16 divisors (see below), whose sum is σ = 1819078560. Its totient is φ = 545723424.

The previous prime is 1023231551. The next prime is 1023231577. The reversal of 1023231555 is 5551323201.

It is a happy number.

1023231555 is a `hidden beast` number, since 102 + 3 + 2 + 3 + 1 + 555 = 666.

It is not a de Polignac number, because 1023231555 - 2² = 1023231551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1023231551) 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 15 ways as a sum of consecutive naturals, for example, 3789612 + ... + 3789881.

It is an arithmetic number, because the mean of its divisors is an integer number (113692410).

Almost surely, 2^1023231555 is an apocalyptic number.

1023231555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1023231555 is a deficient number, since it is larger than the sum of its proper divisors (795847005).

1023231555 is an equidigital number, since it uses as much as digits as its factorization.

1023231555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7579507 (or 7579501 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 1023231555 is about 31987.9907934212. The cubic root of 1023231555 is about 1007.6846466041.

Adding to 1023231555 its reverse (5551323201), we get a palindrome (6574554756).

The spelling of 1023231555 in words is "one billion, twenty-three million, two hundred thirty-one thousand, five hundred fifty-five".