1111978139 has 2 divisors, whose sum is σ = 1111978140. Its totient is φ = 1111978138.

The previous prime is 1111978103. The next prime is 1111978159. The reversal of 1111978139 is 9318791111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111978139 - 2⁸ = 1111977883 is a prime.

It is a super-2 number, since 2×1111978139² = 2472990763227806642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1111978096 and 1111978105.

It is not a weakly prime, because it can be changed into another prime (1111978159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555989069 + 555989070.

It is an arithmetic number, because the mean of its divisors is an integer number (555989070).

Almost surely, 2^1111978139 is an apocalyptic number.

1111978139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111978139 is an equidigital number, since it uses as much as digits as its factorization.

1111978139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 41.

The square root of 1111978139 is about 33346.3362155425. The cubic root of 1111978139 is about 1036.0135043310.

The spelling of 1111978139 in words is "one billion, one hundred eleven million, nine hundred seventy-eight thousand, one hundred thirty-nine".