1201555125 has 48 divisors (see below), whose sum is σ = 2201637360. Its totient is φ = 630288000.

The previous prime is 1201555123. The next prime is 1201555139. The reversal of 1201555125 is 5215551021.

It can be written as a sum of positive squares in 8 ways, for example, as 1091179089 + 110376036 = 33033^2 + 10506^2 .

It is not a de Polignac number, because 1201555125 - 2¹ = 1201555123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201555123) 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 47 ways as a sum of consecutive naturals, for example, 59871 + ... + 77379.

It is an arithmetic number, because the mean of its divisors is an integer number (45867445).

Almost surely, 2^1201555125 is an apocalyptic number.

1201555125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1201555125 is a deficient number, since it is larger than the sum of its proper divisors (1000082235).

1201555125 is a wasteful number, since it uses less digits than its factorization.

1201555125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17591 (or 17578 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1201555125 is about 34663.4551797711. The cubic root of 1201555125 is about 1063.1174173900.

The spelling of 1201555125 in words is "one billion, two hundred one million, five hundred fifty-five thousand, one hundred twenty-five".