1242700091 has 2 divisors, whose sum is σ = 1242700092. Its totient is φ = 1242700090.

The previous prime is 1242700049. The next prime is 1242700117. The reversal of 1242700091 is 1900072421.

It is an a-pointer prime, because the next prime (1242700117) can be obtained adding 1242700091 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242700091 - 2⁶ = 1242700027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242700091.

It is not a weakly prime, because it can be changed into another prime (1242700031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621350045 + 621350046.

It is an arithmetic number, because the mean of its divisors is an integer number (621350046).

Almost surely, 2^1242700091 is an apocalyptic number.

1242700091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242700091 is an equidigital number, since it uses as much as digits as its factorization.

1242700091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1242700091 is about 35251.9515913658. The cubic root of 1242700091 is about 1075.1162927373.

The spelling of 1242700091 in words is "one billion, two hundred forty-two million, seven hundred thousand, ninety-one".