1955988787 has 2 divisors, whose sum is σ = 1955988788. Its totient is φ = 1955988786.

The previous prime is 1955988677. The next prime is 1955988799. The reversal of 1955988787 is 7878895591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1955988787 - 2⁷ = 1955988659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1955988187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977994393 + 977994394.

It is an arithmetic number, because the mean of its divisors is an integer number (977994394).

Almost surely, 2^1955988787 is an apocalyptic number.

1955988787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955988787 is an equidigital number, since it uses as much as digits as its factorization.

1955988787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 67.

The square root of 1955988787 is about 44226.5620074633. The cubic root of 1955988787 is about 1250.6106428703.

The spelling of 1955988787 in words is "one billion, nine hundred fifty-five million, nine hundred eighty-eight thousand, seven hundred eighty-seven".