1242267157 has 2 divisors, whose sum is σ = 1242267158. Its totient is φ = 1242267156.

The previous prime is 1242267149. The next prime is 1242267203. The reversal of 1242267157 is 7517622421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1035166276 + 207100881 = 32174^2 + 14391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242267157 - 2³ = 1242267149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242267127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621133578 + 621133579.

It is an arithmetic number, because the mean of its divisors is an integer number (621133579).

Almost surely, 2^1242267157 is an apocalyptic number.

It is an amenable number.

1242267157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242267157 is an equidigital number, since it uses as much as digits as its factorization.

1242267157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 1242267157 is about 35245.8104886240. The cubic root of 1242267157 is about 1074.9914279468.

Adding to 1242267157 its reverse (7517622421), we get a palindrome (8759889578).

The spelling of 1242267157 in words is "one billion, two hundred forty-two million, two hundred sixty-seven thousand, one hundred fifty-seven".