1242673291 has 2 divisors, whose sum is σ = 1242673292. Its totient is φ = 1242673290.

The previous prime is 1242673249. The next prime is 1242673303. The reversal of 1242673291 is 1923762421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242673291 - 2¹⁹ = 1242149003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242673291.

It is not a weakly prime, because it can be changed into another prime (1242670291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621336645 + 621336646.

It is an arithmetic number, because the mean of its divisors is an integer number (621336646).

Almost surely, 2^1242673291 is an apocalyptic number.

1242673291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242673291 is an equidigital number, since it uses as much as digits as its factorization.

1242673291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 1242673291 is about 35251.5714685175. The cubic root of 1242673291 is about 1075.1085640493.

The spelling of 1242673291 in words is "one billion, two hundred forty-two million, six hundred seventy-three thousand, two hundred ninety-one".