255421551 has 32 divisors (see below), whose sum is σ = 425852928. Its totient is φ = 132294240.

The previous prime is 255421499. The next prime is 255421559. The reversal of 255421551 is 155124552.

It is not a de Polignac number, because 255421551 - 2¹⁰ = 255420527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255421559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87030 + ... + 89916.

It is an arithmetic number, because the mean of its divisors is an integer number (13307904).

Almost surely, 2^255421551 is an apocalyptic number.

255421551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

255421551 is a deficient number, since it is larger than the sum of its proper divisors (170431377).

255421551 is a wasteful number, since it uses less digits than its factorization.

255421551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291.

The product of its digits is 10000, while the sum is 30.

The square root of 255421551 is about 15981.9132459165. The cubic root of 255421551 is about 634.4818150469.

The spelling of 255421551 in words is "two hundred fifty-five million, four hundred twenty-one thousand, five hundred fifty-one".