1243542151 has 2 divisors, whose sum is σ = 1243542152. Its totient is φ = 1243542150.

The previous prime is 1243542143. The next prime is 1243542161. The reversal of 1243542151 is 1512453421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243542151 - 2³ = 1243542143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243542161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621771075 + 621771076.

It is an arithmetic number, because the mean of its divisors is an integer number (621771076).

Almost surely, 2^1243542151 is an apocalyptic number.

1243542151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243542151 is an equidigital number, since it uses as much as digits as its factorization.

1243542151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 28.

The square root of 1243542151 is about 35263.8930210492. The cubic root of 1243542151 is about 1075.3590726935.

Adding to 1243542151 its reverse (1512453421), we get a palindrome (2755995572).

The spelling of 1243542151 in words is "one billion, two hundred forty-three million, five hundred forty-two thousand, one hundred fifty-one".