1201242143 has 2 divisors, whose sum is σ = 1201242144. Its totient is φ = 1201242142.

The previous prime is 1201242131. The next prime is 1201242169. The reversal of 1201242143 is 3412421021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201242143 - 2⁸ = 1201241887 is a prime.

It is a super-2 number, since 2×1201242143² = 2885965372238464898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201242043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600621071 + 600621072.

It is an arithmetic number, because the mean of its divisors is an integer number (600621072).

Almost surely, 2^1201242143 is an apocalyptic number.

1201242143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201242143 is an equidigital number, since it uses as much as digits as its factorization.

1201242143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1201242143 is about 34658.9403040543. The cubic root of 1201242143 is about 1063.0251021608.

Adding to 1201242143 its reverse (3412421021), we get a palindrome (4613663164).

The spelling of 1201242143 in words is "one billion, two hundred one million, two hundred forty-two thousand, one hundred forty-three".