1200231555 has 16 divisors (see below), whose sum is σ = 1986590880. Its totient is φ = 618050048.

The previous prime is 1200231541. The next prime is 1200231589. The reversal of 1200231555 is 5551320021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1200231555 - 2⁶ = 1200231491 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1379142 + ... + 1380011.

It is an arithmetic number, because the mean of its divisors is an integer number (124161930).

Almost surely, 2^1200231555 is an apocalyptic number.

1200231555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1200231555 is a deficient number, since it is larger than the sum of its proper divisors (786359325).

1200231555 is a wasteful number, since it uses less digits than its factorization.

1200231555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2759190.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 1200231555 is about 34644.3581987024. The cubic root of 1200231555 is about 1062.7269158714.

Adding to 1200231555 its reverse (5551320021), we get a palindrome (6751551576).

The spelling of 1200231555 in words is "one billion, two hundred million, two hundred thirty-one thousand, five hundred fifty-five".