142195687 has 2 divisors, whose sum is σ = 142195688. Its totient is φ = 142195686.

The previous prime is 142195673. The next prime is 142195693. The reversal of 142195687 is 786591241.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142195687 is a prime.

It is a super-2 number, since 2×142195687² = 40439226802803938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142195607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71097843 + 71097844.

It is an arithmetic number, because the mean of its divisors is an integer number (71097844).

Almost surely, 2^142195687 is an apocalyptic number.

142195687 is a deficient number, since it is larger than the sum of its proper divisors (1).

142195687 is an equidigital number, since it uses as much as digits as its factorization.

142195687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 142195687 is about 11924.5833050887. The cubic root of 142195687 is about 521.9498870483.

The spelling of 142195687 in words is "one hundred forty-two million, one hundred ninety-five thousand, six hundred eighty-seven".