131204551 has 4 divisors (see below), whose sum is σ = 134404704. Its totient is φ = 128004400.

The previous prime is 131204537. The next prime is 131204587. The reversal of 131204551 is 155402131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131204551 - 2⁹ = 131204039 is a prime.

It is a super-2 number, since 2×131204551² = 34429268406223202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131204501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600015 + ... + 1600096.

It is an arithmetic number, because the mean of its divisors is an integer number (33601176).

Almost surely, 2^131204551 is an apocalyptic number.

131204551 is a deficient number, since it is larger than the sum of its proper divisors (3200153).

131204551 is an equidigital number, since it uses as much as digits as its factorization.

131204551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200152.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 131204551 is about 11454.4555086656. The cubic root of 131204551 is about 508.1395123362.

Adding to 131204551 its reverse (155402131), we get a palindrome (286606682).

It can be divided in two parts, 13120 and 4551, that added together give a palindrome (17671).

The spelling of 131204551 in words is "one hundred thirty-one million, two hundred four thousand, five hundred fifty-one".