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1131231389 is a prime number
BaseRepresentation
bin100001101101101…
…0011100010011101
32220211121111201212
41003123103202131
54304043401024
6304130114205
740014210461
oct10333234235
92824544655
101131231389
11530606982
12276a1b965
131504972b2
14aa34c4a1
15694a4a0e
hex436d389d

1131231389 has 2 divisors, whose sum is σ = 1131231390. Its totient is φ = 1131231388.

The previous prime is 1131231383. The next prime is 1131231421. The reversal of 1131231389 is 9831321311.

It is an a-pointer prime, because the next prime (1131231421) can be obtained adding 1131231389 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084582489 + 46648900 = 32933^2 + 6830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1131231389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131231383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565615694 + 565615695.

It is an arithmetic number, because the mean of its divisors is an integer number (565615695).

Almost surely, 21131231389 is an apocalyptic number.

It is an amenable number.

1131231389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131231389 is an equidigital number, since it uses as much as digits as its factorization.

1131231389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 1131231389 is about 33633.7834475992. The cubic root of 1131231389 is about 1041.9586452961.

The spelling of 1131231389 in words is "one billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred eighty-nine".