1200551 has 4 divisors (see below), whose sum is σ = 1309704. Its totient is φ = 1091400.

The previous prime is 1200527. The next prime is 1200581. The reversal of 1200551 is 1550021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200551 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200581) 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, 54560 + ... + 54581.

It is an arithmetic number, because the mean of its divisors is an integer number (327426).

2^1200551 is an apocalyptic number.

1200551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200551 is a deficient number, since it is larger than the sum of its proper divisors (109153).

1200551 is a wasteful number, since it uses less digits than its factorization.

1200551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109152.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1200551 is about 1095.6965820883. The cubic root of 1200551 is about 106.2821190093.

Adding to 1200551 its reverse (1550021), we get a palindrome (2750572).

The spelling of 1200551 in words is "one million, two hundred thousand, five hundred fifty-one".