1000151221 has 2 divisors, whose sum is σ = 1000151222. Its totient is φ = 1000151220.

The previous prime is 1000151219. The next prime is 1000151237. The reversal of 1000151221 is 1221510001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763914321 + 236236900 = 27639^2 + 15370^2 .

It is an emirp because it is prime and its reverse (1221510001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000151221 - 2¹ = 1000151219 is a prime.

Together with 1000151219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000151261) 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, 500075610 + 500075611.

It is an arithmetic number, because the mean of its divisors is an integer number (500075611).

Almost surely, 2^1000151221 is an apocalyptic number.

It is an amenable number.

1000151221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000151221 is an equidigital number, since it uses as much as digits as its factorization.

1000151221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1000151221 is about 31625.1675252480. The cubic root of 1000151221 is about 1000.0504044593.

Adding to 1000151221 its reverse (1221510001), we get a palindrome (2221661222).

The spelling of 1000151221 in words is "one billion, one hundred fifty-one thousand, two hundred twenty-one".