146981139 has 4 divisors (see below), whose sum is σ = 195974856. Its totient is φ = 97987424.

The previous prime is 146981111. The next prime is 146981141. The reversal of 146981139 is 931189641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931189641 = 3 ⋅310396547.

It is a cyclic number.

It is not a de Polignac number, because 146981139 - 2⁷ = 146981011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 146981139.

It is not an unprimeable number, because it can be changed into a prime (146981239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24496854 + ... + 24496859.

It is an arithmetic number, because the mean of its divisors is an integer number (48993714).

Almost surely, 2^146981139 is an apocalyptic number.

146981139 is a deficient number, since it is larger than the sum of its proper divisors (48993717).

146981139 is an equidigital number, since it uses as much as digits as its factorization.

146981139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48993716.

The product of its digits is 46656, while the sum is 42.

The square root of 146981139 is about 12123.5778135004. The cubic root of 146981139 is about 527.7406360747.

The spelling of 146981139 in words is "one hundred forty-six million, nine hundred eighty-one thousand, one hundred thirty-nine".