261335026 has 4 divisors (see below), whose sum is σ = 392002542. Its totient is φ = 130667512.

The previous prime is 261335023. The next prime is 261335027. The reversal of 261335026 is 620533162.

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

It can be written as a sum of positive squares in only one way, i.e., 251190801 + 10144225 = 15849^2 + 3185^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261334985 and 261335003.

It is not an unprimeable number, because it can be changed into a prime (261335023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65333755 + ... + 65333758.

Almost surely, 2^261335026 is an apocalyptic number.

261335026 is a deficient number, since it is larger than the sum of its proper divisors (130667516).

261335026 is a wasteful number, since it uses less digits than its factorization.

261335026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130667515.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 261335026 is about 16165.8598905224. The cubic root of 261335026 is about 639.3409768947.

Adding to 261335026 its reverse (620533162), we get a palindrome (881868188).

The spelling of 261335026 in words is "two hundred sixty-one million, three hundred thirty-five thousand, twenty-six".