261008331 has 8 divisors (see below), whose sum is σ = 348194880. Its totient is φ = 173913672.

The previous prime is 261008329. The next prime is 261008333. The reversal of 261008331 is 133800162.

It is an interprime number because it is at equal distance from previous prime (261008329) and next prime (261008333).

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

It is not a de Polignac number, because 261008331 - 2¹ = 261008329 is a prime.

It is a super-2 number, since 2×261008331² = 136250697702811122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261008333) 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, 16045 + ... + 27918.

It is an arithmetic number, because the mean of its divisors is an integer number (43524360).

Almost surely, 2^261008331 is an apocalyptic number.

261008331 is a deficient number, since it is larger than the sum of its proper divisors (87186549).

261008331 is a wasteful number, since it uses less digits than its factorization.

261008331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45945.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261008331 is about 16155.7522573231. The cubic root of 261008331 is about 639.0744523495.

Adding to 261008331 its reverse (133800162), we get a palindrome (394808493).

The spelling of 261008331 in words is "two hundred sixty-one million, eight thousand, three hundred thirty-one".