261030026 has 8 divisors (see below), whose sum is σ = 401095044. Its totient is φ = 127331680.

The previous prime is 261030023. The next prime is 261030043. The reversal of 261030026 is 620030162.

It can be written as a sum of positive squares in 2 ways, for example, as 224970001 + 36060025 = 14999^2 + 6005^2 .

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

It is not an unprimeable number, because it can be changed into a prime (261030023) 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, 1591565 + ... + 1591728.

Almost surely, 2^261030026 is an apocalyptic number.

261030026 is a deficient number, since it is larger than the sum of its proper divisors (140065018).

261030026 is a wasteful number, since it uses less digits than its factorization.

261030026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183336.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 261030026 is about 16156.4236760491. The cubic root of 261030026 is about 639.0921584715.

Adding to 261030026 its reverse (620030162), we get a palindrome (881060188).

The spelling of 261030026 in words is "two hundred sixty-one million, thirty thousand, twenty-six".