1955291609 has 2 divisors, whose sum is σ = 1955291610. Its totient is φ = 1955291608.

The previous prime is 1955291581. The next prime is 1955291707. The reversal of 1955291609 is 9061925591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1107025984 + 848265625 = 33272^2 + 29125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955291609 - 2¹² = 1955287513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1955293609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977645804 + 977645805.

It is an arithmetic number, because the mean of its divisors is an integer number (977645805).

Almost surely, 2^1955291609 is an apocalyptic number.

It is an amenable number.

1955291609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955291609 is an equidigital number, since it uses as much as digits as its factorization.

1955291609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 218700, while the sum is 47.

The square root of 1955291609 is about 44218.6794126645. The cubic root of 1955291609 is about 1250.4620391148.

The spelling of 1955291609 in words is "one billion, nine hundred fifty-five million, two hundred ninety-one thousand, six hundred nine".