131121031 has 2 divisors, whose sum is σ = 131121032. Its totient is φ = 131121030.

The previous prime is 131120989. The next prime is 131121113. The reversal of 131121031 is 130121131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131121031 - 2⁹ = 131120519 is a prime.

It is a super-2 number, since 2×131121031² = 34385449541005922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131121131) 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 as a sum of consecutive naturals, namely, 65560515 + 65560516.

It is an arithmetic number, because the mean of its divisors is an integer number (65560516).

Almost surely, 2^131121031 is an apocalyptic number.

131121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121031 is an equidigital number, since it uses as much as digits as its factorization.

131121031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 131121031 is about 11450.8091853807. The cubic root of 131121031 is about 508.0316684641.

Adding to 131121031 its reverse (130121131), we get a palindrome (261242162).

The spelling of 131121031 in words is "one hundred thirty-one million, one hundred twenty-one thousand, thirty-one".