1955972609 has 6 divisors (see below), whose sum is σ = 2003969394. Its totient is φ = 1907989680.

The previous prime is 1955972591. The next prime is 1955972653. The reversal of 1955972609 is 9062795591.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1192666225 + 763306384 = 34535^2 + 27628^2 .

It is not a de Polignac number, because 1955972609 - 2⁸ = 1955972353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955372609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279734 + ... + 286640.

It is an arithmetic number, because the mean of its divisors is an integer number (333994899).

Almost surely, 2^1955972609 is an apocalyptic number.

It is an amenable number.

1955972609 is a deficient number, since it is larger than the sum of its proper divisors (47996785).

1955972609 is an frugal number, since it uses more digits than its factorization.

1955972609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13855 (or 6948 counting only the distinct ones).

The product of its (nonzero) digits is 1530900, while the sum is 53.

The square root of 1955972609 is about 44226.3791079487. The cubic root of 1955972609 is about 1250.6071949237.

The spelling of 1955972609 in words is "one billion, nine hundred fifty-five million, nine hundred seventy-two thousand, six hundred nine".