521401255 has 8 divisors (see below), whose sum is σ = 627941952. Its totient is φ = 415614048.

The previous prime is 521401241. The next prime is 521401261. The reversal of 521401255 is 552104125.

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 521401255 - 2⁹ = 521400743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 186847 + ... + 189616.

It is an arithmetic number, because the mean of its divisors is an integer number (78492744).

Almost surely, 2^521401255 is an apocalyptic number.

521401255 is a deficient number, since it is larger than the sum of its proper divisors (106540697).

521401255 is a wasteful number, since it uses less digits than its factorization.

521401255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376745.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 521401255 is about 22834.2123796727. The cubic root of 521401255 is about 804.8668195247.

The spelling of 521401255 in words is "five hundred twenty-one million, four hundred one thousand, two hundred fifty-five".