251061 has 8 divisors (see below), whose sum is σ = 341280. Its totient is φ = 164112.

The previous prime is 251059. The next prime is 251063. The reversal of 251061 is 160152.

251061 = 163² + 164² + ... + 171².

It is an interprime number because it is at equal distance from previous prime (251059) and next prime (251063).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251061 - 2¹ = 251059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631 + ... + 948.

It is an arithmetic number, because the mean of its divisors is an integer number (42660).

2²⁵¹⁰⁶¹ is an apocalyptic number.

It is an amenable number.

251061 is a deficient number, since it is larger than the sum of its proper divisors (90219).

251061 is a wasteful number, since it uses less digits than its factorization.

251061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 251061 is about 501.0598766615. The cubic root of 251061 is about 63.0850451339.

Subtracting from 251061 its product of nonzero digits (60), we obtain a square (251001 = 501²).

Subtracting from 251061 its reverse (160152), we obtain a palindrome (90909).

The spelling of 251061 in words is "two hundred fifty-one thousand, sixty-one".