1000012157 has 2 divisors, whose sum is σ = 1000012158. Its totient is φ = 1000012156.

The previous prime is 1000012121. The next prime is 1000012177. The reversal of 1000012157 is 7512100001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834400996 + 165611161 = 28886^2 + 12869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000012157 - 2¹⁶ = 999946621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000012177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500006078 + 500006079.

It is an arithmetic number, because the mean of its divisors is an integer number (500006079).

Almost surely, 2^1000012157 is an apocalyptic number.

It is an amenable number.

1000012157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000012157 is an equidigital number, since it uses as much as digits as its factorization.

1000012157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 1000012157 is about 31622.9688201472. The cubic root of 1000012157 is about 1000.0040523169.

Adding to 1000012157 its reverse (7512100001), we get a palindrome (8512112158).

The spelling of 1000012157 in words is "one billion, twelve thousand, one hundred fifty-seven".