142981391 has 16 divisors (see below), whose sum is σ = 168715008. Its totient is φ = 118622400.

The previous prime is 142981387. The next prime is 142981411. The reversal of 142981391 is 193189241.

It is a cyclic number.

It is not a de Polignac number, because 142981391 - 2² = 142981387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142981991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35696 + ... + 39498.

It is an arithmetic number, because the mean of its divisors is an integer number (10544688).

Almost surely, 2^142981391 is an apocalyptic number.

142981391 is a deficient number, since it is larger than the sum of its proper divisors (25733617).

142981391 is a wasteful number, since it uses less digits than its factorization.

142981391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982.

The product of its digits is 15552, while the sum is 38.

The square root of 142981391 is about 11957.4826364080. The cubic root of 142981391 is about 522.9094686381.

The spelling of 142981391 in words is "one hundred forty-two million, nine hundred eighty-one thousand, three hundred ninety-one".