1200040551 has 24 divisors (see below), whose sum is σ = 1851873920. Its totient is φ = 746600976.

The previous prime is 1200040547. The next prime is 1200040553. The reversal of 1200040551 is 1550400021.

It is not a de Polignac number, because 1200040551 - 2² = 1200040547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200040553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40915 + ... + 63828.

Almost surely, 2^1200040551 is an apocalyptic number.

1200040551 is a deficient number, since it is larger than the sum of its proper divisors (651833369).

1200040551 is a wasteful number, since it uses less digits than its factorization.

1200040551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104835 (or 104832 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1200040551 is about 34641.6014497021. The cubic root of 1200040551 is about 1062.6705390110.

Adding to 1200040551 its reverse (1550400021), we get a palindrome (2750440572).

The spelling of 1200040551 in words is "one billion, two hundred million, forty thousand, five hundred fifty-one".