261153407 has 4 divisors (see below), whose sum is σ = 264831696. Its totient is φ = 257475120.

The previous prime is 261153401. The next prime is 261153413. The reversal of 261153407 is 704351162.

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

It is an interprime number because it is at equal distance from previous prime (261153401) and next prime (261153413).

It is a cyclic number.

It is not a de Polignac number, because 261153407 - 2¹⁸ = 260891263 is a prime.

It is a super-2 number, since 2×261153407² = 136402203975415298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261153407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261153401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1839038 + ... + 1839179.

It is an arithmetic number, because the mean of its divisors is an integer number (66207924).

Almost surely, 2^261153407 is an apocalyptic number.

261153407 is a deficient number, since it is larger than the sum of its proper divisors (3678289).

261153407 is an equidigital number, since it uses as much as digits as its factorization.

261153407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678288.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261153407 is about 16160.2415514125. The cubic root of 261153407 is about 639.1928357901.

The spelling of 261153407 in words is "two hundred sixty-one million, one hundred fifty-three thousand, four hundred seven".