1200515081 has 4 divisors (see below), whose sum is σ = 1208465664. Its totient is φ = 1192564500.

The previous prime is 1200515077. The next prime is 1200515089. The reversal of 1200515081 is 1805150021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1805150021 = 401 ⋅4501621.

It is a cyclic number.

It is not a de Polignac number, because 1200515081 - 2² = 1200515077 is a prime.

It is a super-2 number, since 2×1200515081² = 2882472919416873122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200515089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3975065 + ... + 3975366.

It is an arithmetic number, because the mean of its divisors is an integer number (302116416).

Almost surely, 2^1200515081 is an apocalyptic number.

It is an amenable number.

1200515081 is a deficient number, since it is larger than the sum of its proper divisors (7950583).

1200515081 is an equidigital number, since it uses as much as digits as its factorization.

1200515081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950582.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 1200515081 is about 34648.4499076077. The cubic root of 1200515081 is about 1062.8105905556.

The spelling of 1200515081 in words is "one billion, two hundred million, five hundred fifteen thousand, eighty-one".