251868141 has 24 divisors (see below), whose sum is σ = 440241984. Its totient is φ = 135457920.

The previous prime is 251868091. The next prime is 251868143. The reversal of 251868141 is 141868152.

It is not a de Polignac number, because 251868141 - 2⁷ = 251868013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 251868096 and 251868105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251868143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116515 + ... + 118656.

It is an arithmetic number, because the mean of its divisors is an integer number (18343416).

Almost surely, 2^251868141 is an apocalyptic number.

251868141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251868141 is a deficient number, since it is larger than the sum of its proper divisors (188373843).

251868141 is a wasteful number, since it uses less digits than its factorization.

251868141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235201 (or 235198 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 251868141 is about 15870.3541548385. The cubic root of 251868141 is about 631.5257727063.

The spelling of 251868141 in words is "two hundred fifty-one million, eight hundred sixty-eight thousand, one hundred forty-one".