261342562031 has 4 divisors (see below), whose sum is σ = 262014394200. Its totient is φ = 260670729864.

The previous prime is 261342562003. The next prime is 261342562051. The reversal of 261342562031 is 130265243162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130265243162 = 2 ⋅65132621581.

It is a cyclic number.

It is not a de Polignac number, because 261342562031 - 2¹⁸ = 261342299887 is a prime.

It is a super-2 number, since 2×261342562031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261342561982 and 261342562000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261342562051) 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 in 3 ways as a sum of consecutive naturals, for example, 335915501 + ... + 335916278.

It is an arithmetic number, because the mean of its divisors is an integer number (65503598550).

Almost surely, 2^261342562031 is an apocalyptic number.

261342562031 is a deficient number, since it is larger than the sum of its proper divisors (671832169).

261342562031 is an equidigital number, since it uses as much as digits as its factorization.

261342562031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671832168.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 261342562031 in words is "two hundred sixty-one billion, three hundred forty-two million, five hundred sixty-two thousand, thirty-one".