147139231 has 4 divisors (see below), whose sum is σ = 148514472. Its totient is φ = 145763992.

The previous prime is 147139229. The next prime is 147139309. The reversal of 147139231 is 132931741.

147139231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 147139231 - 2¹ = 147139229 is a prime.

It is a super-2 number, since 2×147139231² = 43299906598542722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 147139193 and 147139202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147139831) 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, 687460 + ... + 687673.

It is an arithmetic number, because the mean of its divisors is an integer number (37128618).

Almost surely, 2^147139231 is an apocalyptic number.

147139231 is a deficient number, since it is larger than the sum of its proper divisors (1375241).

147139231 is a wasteful number, since it uses less digits than its factorization.

147139231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375240.

The product of its digits is 4536, while the sum is 31.

The square root of 147139231 is about 12130.0960837085. The cubic root of 147139231 is about 527.9297797935.

The spelling of 147139231 in words is "one hundred forty-seven million, one hundred thirty-nine thousand, two hundred thirty-one".