131042251 has 4 divisors (see below), whose sum is σ = 133830432. Its totient is φ = 128254072.

The previous prime is 131042231. The next prime is 131042267. The reversal of 131042251 is 152240131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152240131 = 379 ⋅401689.

It is a cyclic number.

It is not a de Polignac number, because 131042251 - 2⁹ = 131041739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131042231) 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, 1394020 + ... + 1394113.

It is an arithmetic number, because the mean of its divisors is an integer number (33457608).

Almost surely, 2^131042251 is an apocalyptic number.

131042251 is a deficient number, since it is larger than the sum of its proper divisors (2788181).

131042251 is an equidigital number, since it uses as much as digits as its factorization.

131042251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788180.

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

The square root of 131042251 is about 11447.3687369631. The cubic root of 131042251 is about 507.9299030629.

Adding to 131042251 its reverse (152240131), we get a palindrome (283282382).

The spelling of 131042251 in words is "one hundred thirty-one million, forty-two thousand, two hundred fifty-one".