131304551 has 4 divisors (see below), whose sum is σ = 150062352. Its totient is φ = 112546752.

The previous prime is 131304533. The next prime is 131304571. The reversal of 131304551 is 155403131.

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-131304551 is a prime.

It is a super-2 number, since 2×131304551² = 34481770226623202, 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 (131304571) 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, 9378890 + ... + 9378903.

It is an arithmetic number, because the mean of its divisors is an integer number (37515588).

Almost surely, 2^131304551 is an apocalyptic number.

131304551 is a deficient number, since it is larger than the sum of its proper divisors (18757801).

131304551 is an equidigital number, since it uses as much as digits as its factorization.

131304551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18757800.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 131304551 is about 11458.8197908860. The cubic root of 131304551 is about 508.2685755603.

Adding to 131304551 its reverse (155403131), we get a palindrome (286707682).

The spelling of 131304551 in words is "one hundred thirty-one million, three hundred four thousand, five hundred fifty-one".