142499921 has 2 divisors, whose sum is σ = 142499922. Its totient is φ = 142499920.

The previous prime is 142499909. The next prime is 142499923. The reversal of 142499921 is 129994241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142444225 + 55696 = 11935^2 + 236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142499921 is a prime.

Together with 142499923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142499923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71249960 + 71249961.

It is an arithmetic number, because the mean of its divisors is an integer number (71249961).

Almost surely, 2^142499921 is an apocalyptic number.

It is an amenable number.

142499921 is a deficient number, since it is larger than the sum of its proper divisors (1).

142499921 is an equidigital number, since it uses as much as digits as its factorization.

142499921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 142499921 is about 11937.3330773670. Note that the first 3 decimals coincide. The cubic root of 142499921 is about 522.3218668885.

The spelling of 142499921 in words is "one hundred forty-two million, four hundred ninety-nine thousand, nine hundred twenty-one".