1001022251 has 2 divisors, whose sum is σ = 1001022252. Its totient is φ = 1001022250.

The previous prime is 1001022229. The next prime is 1001022259. The reversal of 1001022251 is 1522201001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001022251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001022259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500511125 + 500511126.

It is an arithmetic number, because the mean of its divisors is an integer number (500511126).

Almost surely, 2^1001022251 is an apocalyptic number.

1001022251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001022251 is an equidigital number, since it uses as much as digits as its factorization.

1001022251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1001022251 is about 31638.9356805819. The cubic root of 1001022251 is about 1000.3406342884.

Adding to 1001022251 its reverse (1522201001), we get a palindrome (2523223252).

The spelling of 1001022251 in words is "one billion, one million, twenty-two thousand, two hundred fifty-one".