1201838551 has 8 divisors (see below), whose sum is σ = 1260584640. Its totient is φ = 1144474848.

The previous prime is 1201838543. The next prime is 1201838557. The reversal of 1201838551 is 1558381021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201838551 - 2³ = 1201838543 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 (1201838557) 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 7 ways as a sum of consecutive naturals, for example, 343816 + ... + 347293.

It is an arithmetic number, because the mean of its divisors is an integer number (157573080).

Almost surely, 2^1201838551 is an apocalyptic number.

1201838551 is a deficient number, since it is larger than the sum of its proper divisors (58746089).

1201838551 is an equidigital number, since it uses as much as digits as its factorization.

1201838551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691193.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 1201838551 is about 34667.5431924444. The cubic root of 1201838551 is about 1063.2010011341.

The spelling of 1201838551 in words is "one billion, two hundred one million, eight hundred thirty-eight thousand, five hundred fifty-one".