261431033 has 8 divisors (see below), whose sum is σ = 266862600. Its totient is φ = 256018048.

The previous prime is 261430991. The next prime is 261431039. The reversal of 261431033 is 330134162.

It can be written as a sum of positive squares in 4 ways, for example, as 22202944 + 239228089 = 4712^2 + 15467^2 .

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 261431033 - 2²⁰ = 260382457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261431039) 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, 25823 + ... + 34491.

It is an arithmetic number, because the mean of its divisors is an integer number (33357825).

Almost surely, 2^261431033 is an apocalyptic number.

It is an amenable number.

261431033 is a deficient number, since it is larger than the sum of its proper divisors (5431567).

261431033 is an equidigital number, since it uses as much as digits as its factorization.

261431033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9291.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 261431033 is about 16168.8290546966. The cubic root of 261431033 is about 639.4192591608.

Adding to 261431033 its reverse (330134162), we get a palindrome (591565195).

The spelling of 261431033 in words is "two hundred sixty-one million, four hundred thirty-one thousand, thirty-three".