1891472339 has 2 divisors, whose sum is σ = 1891472340. Its totient is φ = 1891472338.

The previous prime is 1891472333. The next prime is 1891472369. The reversal of 1891472339 is 9332741981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1891472339 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1891472293 and 1891472302.

It is not a weakly prime, because it can be changed into another prime (1891472333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945736169 + 945736170.

It is an arithmetic number, because the mean of its divisors is an integer number (945736170).

Almost surely, 2^1891472339 is an apocalyptic number.

1891472339 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891472339 is an equidigital number, since it uses as much as digits as its factorization.

1891472339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 1891472339 is about 43491.0604492463. The cubic root of 1891472339 is about 1236.7065610584.

The spelling of 1891472339 in words is "one billion, eight hundred ninety-one million, four hundred seventy-two thousand, three hundred thirty-nine".