1985511967 has 2 divisors, whose sum is σ = 1985511968. Its totient is φ = 1985511966.

The previous prime is 1985511959. The next prime is 1985512003. The reversal of 1985511967 is 7691155891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985511967 - 2³ = 1985511959 is a prime.

It is a super-2 number, since 2×1985511967² = 7884515542200418178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985511937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992755983 + 992755984.

It is an arithmetic number, because the mean of its divisors is an integer number (992755984).

Almost surely, 2^1985511967 is an apocalyptic number.

1985511967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985511967 is an equidigital number, since it uses as much as digits as its factorization.

1985511967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 52.

The square root of 1985511967 is about 44559.0840009083. The cubic root of 1985511967 is about 1256.8713777475.

The spelling of 1985511967 in words is "one billion, nine hundred eighty-five million, five hundred eleven thousand, nine hundred sixty-seven".