142171957 has 2 divisors, whose sum is σ = 142171958. Its totient is φ = 142171956.

The previous prime is 142171903. The next prime is 142171961. The reversal of 142171957 is 759171241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133610481 + 8561476 = 11559^2 + 2926^2 .

It is a cyclic number.

It is not a de Polignac number, because 142171957 - 2⁷ = 142171829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142181957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71085978 + 71085979.

It is an arithmetic number, because the mean of its divisors is an integer number (71085979).

Almost surely, 2^142171957 is an apocalyptic number.

It is an amenable number.

142171957 is a deficient number, since it is larger than the sum of its proper divisors (1).

142171957 is an equidigital number, since it uses as much as digits as its factorization.

142171957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 142171957 is about 11923.5882602512. The cubic root of 142171957 is about 521.9208506311.

The spelling of 142171957 in words is "one hundred forty-two million, one hundred seventy-one thousand, nine hundred fifty-seven".