1920155429 has 2 divisors, whose sum is σ = 1920155430. Its totient is φ = 1920155428.

The previous prime is 1920155417. The next prime is 1920155431. The reversal of 1920155429 is 9245510291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1918264804 + 1890625 = 43798^2 + 1375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920155429 is a prime.

Together with 1920155431, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1920155392 and 1920155401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920155329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960077714 + 960077715.

It is an arithmetic number, because the mean of its divisors is an integer number (960077715).

Almost surely, 2^1920155429 is an apocalyptic number.

It is an amenable number.

1920155429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920155429 is an equidigital number, since it uses as much as digits as its factorization.

1920155429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1920155429 is about 43819.5781472163. The cubic root of 1920155429 is about 1242.9265399517.

The spelling of 1920155429 in words is "one billion, nine hundred twenty million, one hundred fifty-five thousand, four hundred twenty-nine".