131554921 has 4 divisors (see below), whose sum is σ = 132105600. Its totient is φ = 131004244.

The previous prime is 131554919. The next prime is 131555003. The reversal of 131554921 is 129455131.

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: 129455131 = 13 ⋅9958087.

It is a cyclic number.

It is not a de Polignac number, because 131554921 - 2¹ = 131554919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131554021) 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, 274981 + ... + 275458.

It is an arithmetic number, because the mean of its divisors is an integer number (33026400).

Almost surely, 2^131554921 is an apocalyptic number.

It is an amenable number.

131554921 is a deficient number, since it is larger than the sum of its proper divisors (550679).

131554921 is an equidigital number, since it uses as much as digits as its factorization.

131554921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550678.

The product of its digits is 5400, while the sum is 31.

The square root of 131554921 is about 11469.7393605958. The cubic root of 131554921 is about 508.5914239941.

The spelling of 131554921 in words is "one hundred thirty-one million, five hundred fifty-four thousand, nine hundred twenty-one".