1649783747 has 2 divisors, whose sum is σ = 1649783748. Its totient is φ = 1649783746.

The previous prime is 1649783743. The next prime is 1649783749. The reversal of 1649783747 is 7473879461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649783747 - 2² = 1649783743 is a prime.

Together with 1649783749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1649783692 and 1649783701.

It is not a weakly prime, because it can be changed into another prime (1649783741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824891873 + 824891874.

It is an arithmetic number, because the mean of its divisors is an integer number (824891874).

Almost surely, 2^1649783747 is an apocalyptic number.

1649783747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649783747 is an equidigital number, since it uses as much as digits as its factorization.

1649783747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 56.

The square root of 1649783747 is about 40617.5300455358. The cubic root of 1649783747 is about 1181.6141242194.

The spelling of 1649783747 in words is "one billion, six hundred forty-nine million, seven hundred eighty-three thousand, seven hundred forty-seven".