261450408931 has 2 divisors, whose sum is σ = 261450408932. Its totient is φ = 261450408930.

The previous prime is 261450408893. The next prime is 261450408983. The reversal of 261450408931 is 139804054162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261450408931 is a prime.

It is a super-2 number, since 2×261450408931² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261450408031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130725204465 + 130725204466.

It is an arithmetic number, because the mean of its divisors is an integer number (130725204466).

Almost surely, 2^261450408931 is an apocalyptic number.

261450408931 is a deficient number, since it is larger than the sum of its proper divisors (1).

261450408931 is an equidigital number, since it uses as much as digits as its factorization.

261450408931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 261450408931 in words is "two hundred sixty-one billion, four hundred fifty million, four hundred eight thousand, nine hundred thirty-one".