131001111 has 8 divisors (see below), whose sum is σ = 194075760. Its totient is φ = 87334056.

The previous prime is 131001061. The next prime is 131001113. The reversal of 131001111 is 111100131.

It is not a de Polignac number, because 131001111 - 2⁶ = 131001047 is a prime.

It is a super-2 number, since 2×131001111² = 34322582166468642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 131001093 and 131001102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131001113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2425920 + ... + 2425973.

It is an arithmetic number, because the mean of its divisors is an integer number (24259470).

Almost surely, 2^131001111 is an apocalyptic number.

131001111 is a deficient number, since it is larger than the sum of its proper divisors (63074649).

131001111 is an equidigital number, since it uses as much as digits as its factorization.

131001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851902 (or 4851896 counting only the distinct ones).

The product of its (nonzero) digits is 3, while the sum is 9.

The square root of 131001111 is about 11445.5716764170. The cubic root of 131001111 is about 507.8767435585.

Adding to 131001111 its reverse (111100131), we get a palindrome (242101242).

The spelling of 131001111 in words is "one hundred thirty-one million, one thousand, one hundred eleven".