131501811 has 16 divisors (see below), whose sum is σ = 205800704. Its totient is φ = 73112544.

The previous prime is 131501807. The next prime is 131501837. The reversal of 131501811 is 118105131.

It is a happy number.

It is not a de Polignac number, because 131501811 - 2² = 131501807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131505811) 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, 83845 + ... + 85398.

It is an arithmetic number, because the mean of its divisors is an integer number (12862544).

Almost surely, 2^131501811 is an apocalyptic number.

131501811 is a deficient number, since it is larger than the sum of its proper divisors (74298893).

131501811 is a wasteful number, since it uses less digits than its factorization.

131501811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169290.

The product of its (nonzero) digits is 120, while the sum is 21.

The square root of 131501811 is about 11467.4239042603. The cubic root of 131501811 is about 508.5229736819.

Adding to 131501811 its reverse (118105131), we get a palindrome (249606942).

The spelling of 131501811 in words is "one hundred thirty-one million, five hundred one thousand, eight hundred eleven".