1201555525 has 6 divisors (see below), whose sum is σ = 1489928882. Its totient is φ = 961244400.

The previous prime is 1201555513. The next prime is 1201555543. The reversal of 1201555525 is 5255551021.

It can be written as a sum of positive squares in 3 ways, for example, as 1695204 + 1199860321 = 1302^2 + 34639^2 .

It is not a de Polignac number, because 1201555525 - 2⁹ = 1201555013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24031086 + ... + 24031135.

Almost surely, 2^1201555525 is an apocalyptic number.

It is an amenable number.

1201555525 is a deficient number, since it is larger than the sum of its proper divisors (288373357).

1201555525 is an equidigital number, since it uses as much as digits as its factorization.

1201555525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48062231 (or 48062226 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 31.

The square root of 1201555525 is about 34663.4609495359. The cubic root of 1201555525 is about 1063.1175353612.

The spelling of 1201555525 in words is "one billion, two hundred one million, five hundred fifty-five thousand, five hundred twenty-five".