1262742121 has 2 divisors, whose sum is σ = 1262742122. Its totient is φ = 1262742120.

The previous prime is 1262742059. The next prime is 1262742193. The reversal of 1262742121 is 1212472621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879952896 + 382789225 = 29664^2 + 19565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1262742121 - 2²⁷ = 1128524393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1262742121.

It is not a weakly prime, because it can be changed into another prime (1262742521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631371060 + 631371061.

It is an arithmetic number, because the mean of its divisors is an integer number (631371061).

Almost surely, 2^1262742121 is an apocalyptic number.

It is an amenable number.

1262742121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1262742121 is an equidigital number, since it uses as much as digits as its factorization.

1262742121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 1262742121 is about 35535.0829603647. The cubic root of 1262742121 is about 1080.8652533958.

The spelling of 1262742121 in words is "one billion, two hundred sixty-two million, seven hundred forty-two thousand, one hundred twenty-one".