1945375139 has 4 divisors (see below), whose sum is σ = 1956620256. Its totient is φ = 1934130024.

The previous prime is 1945375051. The next prime is 1945375177. The reversal of 1945375139 is 9315735491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315735491 = 83 ⋅112237777.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945375139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1945375093 and 1945375102.

It is not an unprimeable number, because it can be changed into a prime (1945377139) 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, 5622299 + ... + 5622644.

It is an arithmetic number, because the mean of its divisors is an integer number (489155064).

Almost surely, 2^1945375139 is an apocalyptic number.

1945375139 is a deficient number, since it is larger than the sum of its proper divisors (11245117).

1945375139 is a wasteful number, since it uses less digits than its factorization.

1945375139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11245116.

The product of its digits is 510300, while the sum is 47.

The square root of 1945375139 is about 44106.4070062389. The cubic root of 1945375139 is about 1248.3445047563.

The spelling of 1945375139 in words is "one billion, nine hundred forty-five million, three hundred seventy-five thousand, one hundred thirty-nine".