131206361261 has 8 divisors (see below), whose sum is σ = 134371405344. Its totient is φ = 128046486960.

The previous prime is 131206361197. The next prime is 131206361263. The reversal of 131206361261 is 162163602131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131206361261 - 2⁶ = 131206361197 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 (131206361263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1241051 + ... + 1342616.

It is an arithmetic number, because the mean of its divisors is an integer number (16796425668).

Almost surely, 2^131206361261 is an apocalyptic number.

It is an amenable number.

131206361261 is a deficient number, since it is larger than the sum of its proper divisors (3165044083).

131206361261 is a wasteful number, since it uses less digits than its factorization.

131206361261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584891.

The product of its (nonzero) digits is 7776, while the sum is 32.

Adding to 131206361261 its reverse (162163602131), we get a palindrome (293369963392).

The spelling of 131206361261 in words is "one hundred thirty-one billion, two hundred six million, three hundred sixty-one thousand, two hundred sixty-one".