255691901 has 4 divisors (see below), whose sum is σ = 255861312. Its totient is φ = 255522492.

The previous prime is 255691879. The next prime is 255691913. The reversal of 255691901 is 109196552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255691901 - 2⁶ = 255691837 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 (255691991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82421 + ... + 85466.

It is an arithmetic number, because the mean of its divisors is an integer number (63965328).

Almost surely, 2^255691901 is an apocalyptic number.

It is an amenable number.

255691901 is a deficient number, since it is larger than the sum of its proper divisors (169411).

255691901 is a wasteful number, since it uses less digits than its factorization.

255691901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169410.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 255691901 is about 15990.3690076246. The cubic root of 255691901 is about 634.7055910940.

The spelling of 255691901 in words is "two hundred fifty-five million, six hundred ninety-one thousand, nine hundred one".