1201100138 has 32 divisors (see below), whose sum is σ = 2092970880. Its totient is φ = 506327040.

The previous prime is 1201100137. The next prime is 1201100149. The reversal of 1201100138 is 8310011021.

It is not an unprimeable number, because it can be changed into a prime (1201100137) 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, 277898 + ... + 282186.

It is an arithmetic number, because the mean of its divisors is an integer number (65405340).

Almost surely, 2^1201100138 is an apocalyptic number.

1201100138 is a deficient number, since it is larger than the sum of its proper divisors (891870742).

1201100138 is a wasteful number, since it uses less digits than its factorization.

1201100138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 1201100138 is about 34656.8916378835. The cubic root of 1201100138 is about 1062.9832119587.

Adding to 1201100138 its reverse (8310011021), we get a palindrome (9511111159).

The spelling of 1201100138 in words is "one billion, two hundred one million, one hundred thousand, one hundred thirty-eight".