1002121157 has 2 divisors, whose sum is σ = 1002121158. Its totient is φ = 1002121156.

The previous prime is 1002121111. The next prime is 1002121171. The reversal of 1002121157 is 7511212001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 891261316 + 110859841 = 29854^2 + 10529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002121157 - 2⁸ = 1002120901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002120157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501060578 + 501060579.

It is an arithmetic number, because the mean of its divisors is an integer number (501060579).

Almost surely, 2^1002121157 is an apocalyptic number.

It is an amenable number.

1002121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002121157 is an equidigital number, since it uses as much as digits as its factorization.

1002121157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 1002121157 is about 31656.2972724227. The cubic root of 1002121157 is about 1000.7065529986.

Adding to 1002121157 its reverse (7511212001), we get a palindrome (8513333158).

The spelling of 1002121157 in words is "one billion, two million, one hundred twenty-one thousand, one hundred fifty-seven".