1242124157 has 2 divisors, whose sum is σ = 1242124158. Its totient is φ = 1242124156.

The previous prime is 1242124129. The next prime is 1242124217. The reversal of 1242124157 is 7514212421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897242116 + 344882041 = 29954^2 + 18571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242124157 - 2²⁶ = 1175015293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242124357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621062078 + 621062079.

It is an arithmetic number, because the mean of its divisors is an integer number (621062079).

Almost surely, 2^1242124157 is an apocalyptic number.

It is an amenable number.

1242124157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242124157 is an equidigital number, since it uses as much as digits as its factorization.

1242124157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 29.

The square root of 1242124157 is about 35243.7818203439. The cubic root of 1242124157 is about 1074.9501781850.

Adding to 1242124157 its reverse (7514212421), we get a palindrome (8756336578).

The spelling of 1242124157 in words is "one billion, two hundred forty-two million, one hundred twenty-four thousand, one hundred fifty-seven".