1647145949 has 2 divisors, whose sum is σ = 1647145950. Its totient is φ = 1647145948.

The previous prime is 1647145937. The next prime is 1647145961. The reversal of 1647145949 is 9495417461.

It is a balanced prime because it is at equal distance from previous prime (1647145937) and next prime (1647145961).

It can be written as a sum of positive squares in only one way, i.e., 999697924 + 647448025 = 31618^2 + 25445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1647145949 - 2⁸ = 1647145693 is a prime.

It is a super-2 number, since 2×1647145949² = 5426179554614221202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1647145897 and 1647145906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1647145919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823572974 + 823572975.

It is an arithmetic number, because the mean of its divisors is an integer number (823572975).

Almost surely, 2^1647145949 is an apocalyptic number.

It is an amenable number.

1647145949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647145949 is an equidigital number, since it uses as much as digits as its factorization.

1647145949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The square root of 1647145949 is about 40585.0458789934. The cubic root of 1647145949 is about 1180.9840371928.

The spelling of 1647145949 in words is "one billion, six hundred forty-seven million, one hundred forty-five thousand, nine hundred forty-nine".