1181920123 has 2 divisors, whose sum is σ = 1181920124. Its totient is φ = 1181920122.

The previous prime is 1181920111. The next prime is 1181920163. The reversal of 1181920123 is 3210291811.

It is a weak prime.

It is an emirp because it is prime and its reverse (3210291811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1181920123 - 2¹³ = 1181911931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1181920091 and 1181920100.

It is not a weakly prime, because it can be changed into another prime (1181920163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590960061 + 590960062.

It is an arithmetic number, because the mean of its divisors is an integer number (590960062).

Almost surely, 2^1181920123 is an apocalyptic number.

1181920123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181920123 is an equidigital number, since it uses as much as digits as its factorization.

1181920123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1181920123 is about 34379.0651850803. The cubic root of 1181920123 is about 1057.2946686125.

The spelling of 1181920123 in words is "one billion, one hundred eighty-one million, nine hundred twenty thousand, one hundred twenty-three".