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1242123811 is a prime number
BaseRepresentation
bin100101000001001…
…0100111000100011
310012120021102112121
41022002110320203
510020440430221
6323131005111
742531610135
oct11202247043
93176242477
101242123811
11588168005
122a7b99797
1316a452906
14bad77055
15740aba41
hex4a094e23

1242123811 has 2 divisors, whose sum is σ = 1242123812. Its totient is φ = 1242123810.

The previous prime is 1242123767. The next prime is 1242123829. The reversal of 1242123811 is 1183212421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1183212421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242123811 - 219 = 1241599523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242123011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621061905 + 621061906.

It is an arithmetic number, because the mean of its divisors is an integer number (621061906).

Almost surely, 21242123811 is an apocalyptic number.

1242123811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242123811 is an equidigital number, since it uses as much as digits as its factorization.

1242123811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 1242123811 is about 35243.7769116762. The cubic root of 1242123811 is about 1074.9500783740.

The spelling of 1242123811 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, eight hundred eleven".