261031431112 has 8 divisors (see below), whose sum is σ = 489433933350. Its totient is φ = 130515715552.

The previous prime is 261031431107. The next prime is 261031431113. The reversal of 261031431112 is 211134130162.

It can be written as a sum of positive squares in only one way, i.e., 239087749156 + 21943681956 = 488966^2 + 148134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261031431113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16314464437 + ... + 16314464452.

Almost surely, 2^261031431112 is an apocalyptic number.

It is an amenable number.

261031431112 is a deficient number, since it is larger than the sum of its proper divisors (228402502238).

261031431112 is a wasteful number, since it uses less digits than its factorization.

261031431112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32628928895 (or 32628928891 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 261031431112 its reverse (211134130162), we get a palindrome (472165561274).

The spelling of 261031431112 in words is "two hundred sixty-one billion, thirty-one million, four hundred thirty-one thousand, one hundred twelve".