1131219978 has 24 divisors (see below), whose sum is σ = 2631818592. Its totient is φ = 323205624.

The previous prime is 1131219953. The next prime is 1131219989. The reversal of 1131219978 is 8799121311.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1923550 + ... + 1924137.

It is an arithmetic number, because the mean of its divisors is an integer number (109659108).

Almost surely, 2^1131219978 is an apocalyptic number.

1131219978 is an abundant number, since it is smaller than the sum of its proper divisors (1500598614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131219978 is a wasteful number, since it uses less digits than its factorization.

1131219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847706 (or 3847699 counting only the distinct ones).

The product of its digits is 27216, while the sum is 42.

The square root of 1131219978 is about 33633.6138111860. The cubic root of 1131219978 is about 1041.9551417895.

The spelling of 1131219978 in words is "one billion, one hundred thirty-one million, two hundred nineteen thousand, nine hundred seventy-eight".