261423423031 has 4 divisors (see below), whose sum is σ = 261424747864. Its totient is φ = 261422098200.

The previous prime is 261423423017. The next prime is 261423423043. The reversal of 261423423031 is 130324324162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261423423031 - 2⁷ = 261423422903 is a prime.

It is a super-2 number, since 2×261423423031² (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 = 261423422984 and 261423423002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261423423731) 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, 300525 + ... + 783046.

It is an arithmetic number, because the mean of its divisors is an integer number (65356186966).

Almost surely, 2^261423423031 is an apocalyptic number.

261423423031 is a deficient number, since it is larger than the sum of its proper divisors (1324833).

261423423031 is a wasteful number, since it uses less digits than its factorization.

261423423031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324832.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 261423423031 its reverse (130324324162), we get a palindrome (391747747193).

The spelling of 261423423031 in words is "two hundred sixty-one billion, four hundred twenty-three million, four hundred twenty-three thousand, thirty-one".