1128981667 has 6 divisors (see below), whose sum is σ = 1240946924. Its totient is φ = 1026346860.

The previous prime is 1128981649. The next prime is 1128981671. The reversal of 1128981667 is 7661898211.

It is not a de Polignac number, because 1128981667 - 2²³ = 1120593059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128981667.

It is not an unprimeable number, because it can be changed into a prime (1128981647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4665093 + ... + 4665334.

Almost surely, 2^1128981667 is an apocalyptic number.

1128981667 is a deficient number, since it is larger than the sum of its proper divisors (111965257).

1128981667 is an equidigital number, since it uses as much as digits as its factorization.

1128981667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9330449 (or 9330438 counting only the distinct ones).

The product of its digits is 290304, while the sum is 49.

The square root of 1128981667 is about 33600.3224240483. The cubic root of 1128981667 is about 1041.2674595747.

The spelling of 1128981667 in words is "one billion, one hundred twenty-eight million, nine hundred eighty-one thousand, six hundred sixty-seven".