255698121 has 12 divisors (see below), whose sum is σ = 396593232. Its totient is φ = 146113128.

The previous prime is 255698119. The next prime is 255698123. The reversal of 255698121 is 121896552.

It is an interprime number because it is at equal distance from previous prime (255698119) and next prime (255698123).

It is not a de Polignac number, because 255698121 - 2¹ = 255698119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255698121.

It is not an unprimeable number, because it can be changed into a prime (255698123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 869575 + ... + 869868.

It is an arithmetic number, because the mean of its divisors is an integer number (33049436).

Almost surely, 2^255698121 is an apocalyptic number.

255698121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255698121 is a deficient number, since it is larger than the sum of its proper divisors (140895111).

255698121 is a wasteful number, since it uses less digits than its factorization.

255698121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739460 (or 1739453 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 255698121 is about 15990.5634985137. The cubic root of 255698121 is about 634.7107377004.

The spelling of 255698121 in words is "two hundred fifty-five million, six hundred ninety-eight thousand, one hundred twenty-one".