142597991 has 2 divisors, whose sum is σ = 142597992. Its totient is φ = 142597990.

The previous prime is 142597979. The next prime is 142597997. The reversal of 142597991 is 199795241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 142597991 - 2⁶ = 142597927 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 (142597997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71298995 + 71298996.

It is an arithmetic number, because the mean of its divisors is an integer number (71298996).

Almost surely, 2^142597991 is an apocalyptic number.

142597991 is a deficient number, since it is larger than the sum of its proper divisors (1).

142597991 is an equidigital number, since it uses as much as digits as its factorization.

142597991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The square root of 142597991 is about 11941.4400722861. The cubic root of 142597991 is about 522.4416619467.

The spelling of 142597991 in words is "one hundred forty-two million, five hundred ninety-seven thousand, nine hundred ninety-one".