131621573 has 4 divisors (see below), whose sum is σ = 134422080. Its totient is φ = 128821068.

The previous prime is 131621563. The next prime is 131621579. The reversal of 131621573 is 375126131.

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: 375126131 = 17 ⋅22066243.

It is a cyclic number.

It is not a de Polignac number, because 131621573 - 2⁴ = 131621557 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 (131621579) 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, 1400183 + ... + 1400276.

It is an arithmetic number, because the mean of its divisors is an integer number (33605520).

Almost surely, 2^131621573 is an apocalyptic number.

It is an amenable number.

131621573 is a deficient number, since it is larger than the sum of its proper divisors (2800507).

131621573 is an equidigital number, since it uses as much as digits as its factorization.

131621573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800506.

The product of its digits is 3780, while the sum is 29.

The square root of 131621573 is about 11472.6445512794. The cubic root of 131621573 is about 508.6773017199.

The spelling of 131621573 in words is "one hundred thirty-one million, six hundred twenty-one thousand, five hundred seventy-three".