142157989 has 2 divisors, whose sum is σ = 142157990. Its totient is φ = 142157988.

The previous prime is 142157891. The next prime is 142157993. The reversal of 142157989 is 989751241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110145025 + 32012964 = 10495^2 + 5658^2 .

It is a cyclic number.

It is not a de Polignac number, because 142157989 - 2⁷ = 142157861 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 (142157189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71078994 + 71078995.

It is an arithmetic number, because the mean of its divisors is an integer number (71078995).

Almost surely, 2^142157989 is an apocalyptic number.

It is an amenable number.

142157989 is a deficient number, since it is larger than the sum of its proper divisors (1).

142157989 is an equidigital number, since it uses as much as digits as its factorization.

142157989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 142157989 is about 11923.0025161450. The cubic root of 142157989 is about 521.9037576465.

It can be divided in two parts, 14 and 2157989, that added together give a triangular number (2158003 = T₂₀₇₇).

The spelling of 142157989 in words is "one hundred forty-two million, one hundred fifty-seven thousand, nine hundred eighty-nine".