1242595261 has 2 divisors, whose sum is σ = 1242595262. Its totient is φ = 1242595260.

The previous prime is 1242595201. The next prime is 1242595273. The reversal of 1242595261 is 1625952421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242562500 + 32761 = 35250^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242595261 - 2¹⁷ = 1242464189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242595261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242595201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621297630 + 621297631.

It is an arithmetic number, because the mean of its divisors is an integer number (621297631).

Almost surely, 2^1242595261 is an apocalyptic number.

It is an amenable number.

1242595261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242595261 is an equidigital number, since it uses as much as digits as its factorization.

1242595261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 1242595261 is about 35250.4646919725. The cubic root of 1242595261 is about 1075.0860608224.

The spelling of 1242595261 in words is "one billion, two hundred forty-two million, five hundred ninety-five thousand, two hundred sixty-one".