255511407 has 4 divisors (see below), whose sum is σ = 340681880. Its totient is φ = 170340936.

The previous prime is 255511397. The next prime is 255511447. The reversal of 255511407 is 704115552.

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

It is not a de Polignac number, because 255511407 - 2⁴ = 255511391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255511447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42585232 + ... + 42585237.

It is an arithmetic number, because the mean of its divisors is an integer number (85170470).

Almost surely, 2^255511407 is an apocalyptic number.

255511407 is a deficient number, since it is larger than the sum of its proper divisors (85170473).

255511407 is an equidigital number, since it uses as much as digits as its factorization.

255511407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85170472.

The product of its (nonzero) digits is 7000, while the sum is 30.

The square root of 255511407 is about 15984.7241765380. The cubic root of 255511407 is about 634.5562088135.

Adding to 255511407 its reverse (704115552), we get a palindrome (959626959).

The spelling of 255511407 in words is "two hundred fifty-five million, five hundred eleven thousand, four hundred seven".