1243154069 has 2 divisors, whose sum is σ = 1243154070. Its totient is φ = 1243154068.

The previous prime is 1243154041. The next prime is 1243154093. The reversal of 1243154069 is 9604513421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177381969 + 65772100 = 34313^2 + 8110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243154069 is a prime.

It is a super-2 number, since 2×1243154069² = 3090864078542513522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243156069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621577034 + 621577035.

It is an arithmetic number, because the mean of its divisors is an integer number (621577035).

Almost surely, 2^1243154069 is an apocalyptic number.

It is an amenable number.

1243154069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243154069 is an equidigital number, since it uses as much as digits as its factorization.

1243154069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1243154069 is about 35258.3900511637. The cubic root of 1243154069 is about 1075.2471957941.

The spelling of 1243154069 in words is "one billion, two hundred forty-three million, one hundred fifty-four thousand, sixty-nine".