1201321131 has 4 divisors (see below), whose sum is σ = 1601761512. Its totient is φ = 800880752.

The previous prime is 1201321127. The next prime is 1201321153. The reversal of 1201321131 is 1311231021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1201321131 - 2² = 1201321127 is a prime.

It is a super-2 number, since 2×1201321131² = 2886344919574238322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1201321131.

It is not an unprimeable number, because it can be changed into a prime (1201321111) 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 3 ways as a sum of consecutive naturals, for example, 200220186 + ... + 200220191.

It is an arithmetic number, because the mean of its divisors is an integer number (400440378).

Almost surely, 2^1201321131 is an apocalyptic number.

1201321131 is a deficient number, since it is larger than the sum of its proper divisors (400440381).

1201321131 is an equidigital number, since it uses as much as digits as its factorization.

1201321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400440380.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1201321131 is about 34660.0797892907. The cubic root of 1201321131 is about 1063.0484014839.

Adding to 1201321131 its reverse (1311231021), we get a palindrome (2512552152).

The spelling of 1201321131 in words is "one billion, two hundred one million, three hundred twenty-one thousand, one hundred thirty-one".