1227909157 has 2 divisors, whose sum is σ = 1227909158. Its totient is φ = 1227909156.

The previous prime is 1227909131. The next prime is 1227909173. The reversal of 1227909157 is 7519097221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081160161 + 146748996 = 32881^2 + 12114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227909157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227909127) 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, 613954578 + 613954579.

It is an arithmetic number, because the mean of its divisors is an integer number (613954579).

Almost surely, 2^1227909157 is an apocalyptic number.

It is an amenable number.

1227909157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227909157 is an equidigital number, since it uses as much as digits as its factorization.

1227909157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 1227909157 is about 35041.5347409328. The cubic root of 1227909157 is about 1070.8338208997.

The spelling of 1227909157 in words is "one billion, two hundred twenty-seven million, nine hundred nine thousand, one hundred fifty-seven".