147121939 has 4 divisors (see below), whose sum is σ = 151867840. Its totient is φ = 142376040.

The previous prime is 147121907. The next prime is 147121951. The reversal of 147121939 is 939121741.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939121741 = 1237 ⋅759193.

It is a cyclic number.

It is not a de Polignac number, because 147121939 - 2⁵ = 147121907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 147121898 and 147121907.

It is not an unprimeable number, because it can be changed into a prime (147121969) 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 3 ways as a sum of consecutive naturals, for example, 2372904 + ... + 2372965.

It is an arithmetic number, because the mean of its divisors is an integer number (37966960).

Almost surely, 2^147121939 is an apocalyptic number.

147121939 is a deficient number, since it is larger than the sum of its proper divisors (4745901).

147121939 is an equidigital number, since it uses as much as digits as its factorization.

147121939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745900.

The product of its digits is 13608, while the sum is 37.

The square root of 147121939 is about 12129.3832901760. The cubic root of 147121939 is about 527.9090979777.

The spelling of 147121939 in words is "one hundred forty-seven million, one hundred twenty-one thousand, nine hundred thirty-nine".