1954447009 has 2 divisors, whose sum is σ = 1954447010. Its totient is φ = 1954447008.

The previous prime is 1954446971. The next prime is 1954447021. The reversal of 1954447009 is 9007444591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276990225 + 677456784 = 35735^2 + 26028^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954447009 - 2¹³ = 1954438817 is a prime.

It is a super-2 number, since 2×1954447009² = 7639726221978092162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1954447909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977223504 + 977223505.

It is an arithmetic number, because the mean of its divisors is an integer number (977223505).

Almost surely, 2^1954447009 is an apocalyptic number.

It is an amenable number.

1954447009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954447009 is an equidigital number, since it uses as much as digits as its factorization.

1954447009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1954447009 is about 44209.1281185232. The cubic root of 1954447009 is about 1250.2819649785.

The spelling of 1954447009 in words is "one billion, nine hundred fifty-four million, four hundred forty-seven thousand, nine".