1985147719 has 2 divisors, whose sum is σ = 1985147720. Its totient is φ = 1985147718.

The previous prime is 1985147707. The next prime is 1985147741. The reversal of 1985147719 is 9177415891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985147719 - 2²³ = 1976759111 is a prime.

It is a super-2 number, since 2×1985147719² = 7881622932501805922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985148719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992573859 + 992573860.

It is an arithmetic number, because the mean of its divisors is an integer number (992573860).

Almost surely, 2^1985147719 is an apocalyptic number.

1985147719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985147719 is an equidigital number, since it uses as much as digits as its factorization.

1985147719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 52.

The square root of 1985147719 is about 44554.9965660418. The cubic root of 1985147719 is about 1256.7945141322.

The spelling of 1985147719 in words is "one billion, nine hundred eighty-five million, one hundred forty-seven thousand, seven hundred nineteen".