261948131 has 8 divisors (see below), whose sum is σ = 268382400. Its totient is φ = 255529512.

The previous prime is 261948119. The next prime is 261948133. The reversal of 261948131 is 131849162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261948131 - 2⁶ = 261948067 is a prime.

It is a super-2 number, since 2×261948131² = 137233646668786322, 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 = 261948091 and 261948100.

It is not an unprimeable number, because it can be changed into a prime (261948133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34520 + ... + 41418.

It is an arithmetic number, because the mean of its divisors is an integer number (33547800).

Almost surely, 2^261948131 is an apocalyptic number.

261948131 is a deficient number, since it is larger than the sum of its proper divisors (6434269).

261948131 is an equidigital number, since it uses as much as digits as its factorization.

261948131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7825.

The product of its digits is 10368, while the sum is 35.

The square root of 261948131 is about 16184.8117381698. The cubic root of 261948131 is about 639.8405616834.

The spelling of 261948131 in words is "two hundred sixty-one million, nine hundred forty-eight thousand, one hundred thirty-one".