131222551 has 4 divisors (see below), whose sum is σ = 131253912. Its totient is φ = 131191192.

The previous prime is 131222503. The next prime is 131222603. The reversal of 131222551 is 155222131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155222131 = 43 ⋅3609817.

It is a cyclic number.

It is not a de Polignac number, because 131222551 - 2⁷ = 131222423 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 (131222501) 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, 8221 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (32813478).

Almost surely, 2^131222551 is an apocalyptic number.

131222551 is a deficient number, since it is larger than the sum of its proper divisors (31361).

131222551 is an equidigital number, since it uses as much as digits as its factorization.

131222551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31360.

The product of its digits is 600, while the sum is 22.

The square root of 131222551 is about 11455.2412021747. The cubic root of 131222551 is about 508.1627485551.

Adding to 131222551 its reverse (155222131), we get a palindrome (286444682).

The spelling of 131222551 in words is "one hundred thirty-one million, two hundred twenty-two thousand, five hundred fifty-one".