142432991 has 2 divisors, whose sum is σ = 142432992. Its totient is φ = 142432990.

The previous prime is 142432981. The next prime is 142433033. The reversal of 142432991 is 199234241.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142432991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142432921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71216495 + 71216496.

It is an arithmetic number, because the mean of its divisors is an integer number (71216496).

Almost surely, 2^142432991 is an apocalyptic number.

142432991 is a deficient number, since it is larger than the sum of its proper divisors (1).

142432991 is an equidigital number, since it uses as much as digits as its factorization.

142432991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 142432991 is about 11934.5293581272. The cubic root of 142432991 is about 522.2400785924.

The spelling of 142432991 in words is "one hundred forty-two million, four hundred thirty-two thousand, nine hundred ninety-one".