1242091061 has 2 divisors, whose sum is σ = 1242091062. Its totient is φ = 1242091060.

The previous prime is 1242091021. The next prime is 1242091063. The reversal of 1242091061 is 1601902421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091046961 + 151044100 = 33031^2 + 12290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242091061 - 2²⁶ = 1174982197 is a prime.

It is a super-2 number, since 2×1242091061² = 3085580407632211442, which contains 22 as substring.

Together with 1242091063, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242091061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242091063) 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, 621045530 + 621045531.

It is an arithmetic number, because the mean of its divisors is an integer number (621045531).

Almost surely, 2^1242091061 is an apocalyptic number.

It is an amenable number.

1242091061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242091061 is an equidigital number, since it uses as much as digits as its factorization.

1242091061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1242091061 is about 35243.3122875816. The cubic root of 1242091061 is about 1074.9406308659.

Adding to 1242091061 its reverse (1601902421), we get a palindrome (2843993482).

The spelling of 1242091061 in words is "one billion, two hundred forty-two million, ninety-one thousand, sixty-one".