131445551 has 4 divisors (see below), whose sum is σ = 131818272. Its totient is φ = 131072832.

The previous prime is 131445473. The next prime is 131445563. The reversal of 131445551 is 155544131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131445551 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 (131445151) 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, 185831 + ... + 186536.

It is an arithmetic number, because the mean of its divisors is an integer number (32954568).

Almost surely, 2^131445551 is an apocalyptic number.

131445551 is a deficient number, since it is larger than the sum of its proper divisors (372721).

131445551 is an equidigital number, since it uses as much as digits as its factorization.

131445551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372720.

The product of its digits is 6000, while the sum is 29.

The square root of 131445551 is about 11464.9706061551. The cubic root of 131445551 is about 508.4504434173.

Adding to 131445551 its reverse (155544131), we get a palindrome (286989682).

The spelling of 131445551 in words is "one hundred thirty-one million, four hundred forty-five thousand, five hundred fifty-one".