1000251 has 12 divisors (see below), whose sum is σ = 1651312. Its totient is φ = 571536.

The previous prime is 1000249. The next prime is 1000253. The reversal of 1000251 is 1520001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1000249) and next prime (1000253).

It is not a de Polignac number, because 1000251 - 2¹ = 1000249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000253) 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, 7876 + ... + 8001.

It is the magic constant of a 126 × 126 magic square.

2^1000251 is an apocalyptic number.

1000251 is a deficient number, since it is larger than the sum of its proper divisors (651061).

1000251 is a wasteful number, since it uses less digits than its factorization.

1000251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15890 (or 15887 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1000251 is about 1000.1254921259. The cubic root of 1000251 is about 100.0083659668.

Adding to 1000251 its reverse (1520001), we get a palindrome (2520252).

The spelling of 1000251 in words is "one million, two hundred fifty-one", and thus it is an aban number.