131211101 has 4 divisors (see below), whose sum is σ = 149955552. Its totient is φ = 112466652.

The previous prime is 131211097. The next prime is 131211133. The reversal of 131211101 is 101112131.

It is a happy number.

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: 101112131 = 7649 ⋅13219.

It is a cyclic number.

It is not a de Polignac number, because 131211101 - 2² = 131211097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211181) 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, 9372215 + ... + 9372228.

It is an arithmetic number, because the mean of its divisors is an integer number (37488888).

Almost surely, 2^131211101 is an apocalyptic number.

It is an amenable number.

131211101 is a deficient number, since it is larger than the sum of its proper divisors (18744451).

131211101 is an equidigital number, since it uses as much as digits as its factorization.

131211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18744450.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 131211101 is about 11454.7414200409. The cubic root of 131211101 is about 508.1479679840.

Adding to 131211101 its reverse (101112131), we get a palindrome (232323232).

The spelling of 131211101 in words is "one hundred thirty-one million, two hundred eleven thousand, one hundred one".