131222251 has 2 divisors, whose sum is σ = 131222252. Its totient is φ = 131222250.

The previous prime is 131222249. The next prime is 131222281. The reversal of 131222251 is 152222131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131222251 - 2¹ = 131222249 is a prime.

Together with 131222249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (131222281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611125 + 65611126.

It is an arithmetic number, because the mean of its divisors is an integer number (65611126).

Almost surely, 2^131222251 is an apocalyptic number.

131222251 is a deficient number, since it is larger than the sum of its proper divisors (1).

131222251 is an equidigital number, since it uses as much as digits as its factorization.

131222251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 131222251 is about 11455.2281077244. The cubic root of 131222251 is about 508.1623613022.

Adding to 131222251 its reverse (152222131), we get a palindrome (283444382).

The spelling of 131222251 in words is "one hundred thirty-one million, two hundred twenty-two thousand, two hundred fifty-one".