142185451 has 2 divisors, whose sum is σ = 142185452. Its totient is φ = 142185450.

The previous prime is 142185443. The next prime is 142185473. The reversal of 142185451 is 154581241.

It is a weak prime.

It is an emirp because it is prime and its reverse (154581241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142185451 - 2³ = 142185443 is a prime.

It is not a weakly prime, because it can be changed into another prime (142185401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71092725 + 71092726.

It is an arithmetic number, because the mean of its divisors is an integer number (71092726).

Almost surely, 2^142185451 is an apocalyptic number.

142185451 is a deficient number, since it is larger than the sum of its proper divisors (1).

142185451 is an equidigital number, since it uses as much as digits as its factorization.

142185451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 31.

The square root of 142185451 is about 11924.1540999771. The cubic root of 142185451 is about 521.9373625071.

The spelling of 142185451 in words is "one hundred forty-two million, one hundred eighty-five thousand, four hundred fifty-one".