1423945121 has 2 divisors, whose sum is σ = 1423945122. Its totient is φ = 1423945120.

The previous prime is 1423945091. The next prime is 1423945163. The reversal of 1423945121 is 1215493241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1251390625 + 172554496 = 35375^2 + 13136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423945121 - 2⁶ = 1423945057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1423945921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711972560 + 711972561.

It is an arithmetic number, because the mean of its divisors is an integer number (711972561).

Almost surely, 2^1423945121 is an apocalyptic number.

It is an amenable number.

1423945121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423945121 is an equidigital number, since it uses as much as digits as its factorization.

1423945121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 1423945121 is about 37735.1973759248. The cubic root of 1423945121 is about 1125.0308129174.

The spelling of 1423945121 in words is "one billion, four hundred twenty-three million, nine hundred forty-five thousand, one hundred twenty-one".