1954562009 has 4 divisors (see below), whose sum is σ = 1959586980. Its totient is φ = 1949537040.

The previous prime is 1954561993. The next prime is 1954562081. The reversal of 1954562009 is 9002654591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1413534409 + 541027600 = 37597^2 + 23260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954562009 - 2⁴ = 1954561993 is a prime.

It is a super-2 number, since 2×1954562009² = 7640625294052232162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1954567009) 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, 2511902 + ... + 2512679.

It is an arithmetic number, because the mean of its divisors is an integer number (489896745).

Almost surely, 2^1954562009 is an apocalyptic number.

It is an amenable number.

1954562009 is a deficient number, since it is larger than the sum of its proper divisors (5024971).

1954562009 is an equidigital number, since it uses as much as digits as its factorization.

1954562009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024970.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 1954562009 is about 44210.4287357632. The cubic root of 1954562009 is about 1250.3064867665.

The spelling of 1954562009 in words is "one billion, nine hundred fifty-four million, five hundred sixty-two thousand, nine".