261107031 has 4 divisors (see below), whose sum is σ = 348142712. Its totient is φ = 174071352.

The previous prime is 261107009. The next prime is 261107069. The reversal of 261107031 is 130701162.

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

It is not a de Polignac number, because 261107031 - 2⁵ = 261106999 is a prime.

It is a super-2 number, since 2×261107031² = 136353763275269922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261106989 and 261107007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261107081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43517836 + ... + 43517841.

It is an arithmetic number, because the mean of its divisors is an integer number (87035678).

Almost surely, 2^261107031 is an apocalyptic number.

261107031 is a deficient number, since it is larger than the sum of its proper divisors (87035681).

261107031 is an equidigital number, since it uses as much as digits as its factorization.

261107031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87035680.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 261107031 is about 16158.8066081626. The cubic root of 261107031 is about 639.1549972872.

Adding to 261107031 its reverse (130701162), we get a palindrome (391808193).

The spelling of 261107031 in words is "two hundred sixty-one million, one hundred seven thousand, thirty-one".