1201231131 has 16 divisors (see below), whose sum is σ = 1622332800. Its totient is φ = 790505408.

The previous prime is 1201231117. The next prime is 1201231153. The reversal of 1201231131 is 1311321021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1201231131 - 2¹⁵ = 1201198363 is a prime.

It is a super-2 number, since 2×1201231131² = 2885912460167078322, 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 1201231131.

It is not an unprimeable number, because it can be changed into a prime (1201231111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172540 + ... + 179366.

It is an arithmetic number, because the mean of its divisors is an integer number (101395800).

Almost surely, 2^1201231131 is an apocalyptic number.

1201231131 is a deficient number, since it is larger than the sum of its proper divisors (421101669).

1201231131 is an equidigital number, since it uses as much as digits as its factorization.

1201231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7578.

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

The square root of 1201231131 is about 34658.7814413606. The cubic root of 1201231131 is about 1063.0218538376.

Adding to 1201231131 its reverse (1311321021), we get a palindrome (2512552152).

The spelling of 1201231131 in words is "one billion, two hundred one million, two hundred thirty-one thousand, one hundred thirty-one".