1955559311 has 2 divisors, whose sum is σ = 1955559312. Its totient is φ = 1955559310.

The previous prime is 1955559257. The next prime is 1955559313. The reversal of 1955559311 is 1139555591.

It is a strong prime.

It is an emirp because it is prime and its reverse (1139555591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1955559311 - 2¹⁰ = 1955558287 is a prime.

Together with 1955559313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955559313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977779655 + 977779656.

It is an arithmetic number, because the mean of its divisors is an integer number (977779656).

Almost surely, 2^1955559311 is an apocalyptic number.

1955559311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955559311 is an equidigital number, since it uses as much as digits as its factorization.

1955559311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151875, while the sum is 44.

The square root of 1955559311 is about 44221.7063329763. The cubic root of 1955559311 is about 1250.5191040749.

The spelling of 1955559311 in words is "one billion, nine hundred fifty-five million, five hundred fifty-nine thousand, three hundred eleven".