1212208157 has 2 divisors, whose sum is σ = 1212208158. Its totient is φ = 1212208156.

The previous prime is 1212208139. The next prime is 1212208187. The reversal of 1212208157 is 7518022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1033558201 + 178649956 = 32149^2 + 13366^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212208157 - 2⁶ = 1212208093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212208117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606104078 + 606104079.

It is an arithmetic number, because the mean of its divisors is an integer number (606104079).

Almost surely, 2^1212208157 is an apocalyptic number.

It is an amenable number.

1212208157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212208157 is an equidigital number, since it uses as much as digits as its factorization.

1212208157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1212208157 is about 34816.7798195066. The cubic root of 1212208157 is about 1066.2500569124.

The spelling of 1212208157 in words is "one billion, two hundred twelve million, two hundred eight thousand, one hundred fifty-seven".