131505553 has 4 divisors (see below), whose sum is σ = 132095488. Its totient is φ = 130915620.

The previous prime is 131505551. The next prime is 131505587. The reversal of 131505553 is 355505131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355505131 = 127 ⋅2799253.

It is a cyclic number.

It is not a de Polignac number, because 131505553 - 2¹ = 131505551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131505551) 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, 294633 + ... + 295078.

It is an arithmetic number, because the mean of its divisors is an integer number (33023872).

Almost surely, 2^131505553 is an apocalyptic number.

It is an amenable number.

131505553 is a deficient number, since it is larger than the sum of its proper divisors (589935).

131505553 is an equidigital number, since it uses as much as digits as its factorization.

131505553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589934.

The product of its (nonzero) digits is 5625, while the sum is 28.

The square root of 131505553 is about 11467.5870609296. The cubic root of 131505553 is about 508.5277971260.

The spelling of 131505553 in words is "one hundred thirty-one million, five hundred five thousand, five hundred fifty-three".