142945931 has 2 divisors, whose sum is σ = 142945932. Its totient is φ = 142945930.

The previous prime is 142945903. The next prime is 142945939. The reversal of 142945931 is 139549241.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142945931 is a prime.

It is a super-4 number, since 4×142945931⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (142945939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71472965 + 71472966.

It is an arithmetic number, because the mean of its divisors is an integer number (71472966).

Almost surely, 2^142945931 is an apocalyptic number.

142945931 is a deficient number, since it is larger than the sum of its proper divisors (1).

142945931 is an equidigital number, since it uses as much as digits as its factorization.

142945931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 142945931 is about 11955.9997909000. Note that the first 3 decimals coincide. The cubic root of 142945931 is about 522.8662371315.

The spelling of 142945931 in words is "one hundred forty-two million, nine hundred forty-five thousand, nine hundred thirty-one".