131603261 has 2 divisors, whose sum is σ = 131603262. Its totient is φ = 131603260.

The previous prime is 131603231. The next prime is 131603279. The reversal of 131603261 is 162306131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118679236 + 12924025 = 10894^2 + 3595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131603261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131603231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65801630 + 65801631.

It is an arithmetic number, because the mean of its divisors is an integer number (65801631).

Almost surely, 2^131603261 is an apocalyptic number.

It is an amenable number.

131603261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131603261 is an equidigital number, since it uses as much as digits as its factorization.

131603261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 131603261 is about 11471.8464512039. The cubic root of 131603261 is about 508.6537105245.

Adding to 131603261 its reverse (162306131), we get a palindrome (293909392).

The spelling of 131603261 in words is "one hundred thirty-one million, six hundred three thousand, two hundred sixty-one".