261126399 has 8 divisors (see below), whose sum is σ = 348458112. Its totient is φ = 173939480.

The previous prime is 261126391. The next prime is 261126431. The reversal of 261126399 is 993621162.

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 261126399 - 2³ = 261126391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261126391) 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, 31917 + ... + 39254.

It is an arithmetic number, because the mean of its divisors is an integer number (43557264).

Almost surely, 2^261126399 is an apocalyptic number.

261126399 is a deficient number, since it is larger than the sum of its proper divisors (87331713).

261126399 is a wasteful number, since it uses less digits than its factorization.

261126399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72397.

The product of its digits is 34992, while the sum is 39.

The square root of 261126399 is about 16159.4058987328. The cubic root of 261126399 is about 639.1708003188.

The spelling of 261126399 in words is "two hundred sixty-one million, one hundred twenty-six thousand, three hundred ninety-nine".