2148765397 has 2 divisors, whose sum is σ = 2148765398. Its totient is φ = 2148765396.

The previous prime is 2148765389. The next prime is 2148765401. The reversal of 2148765397 is 7935678412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1658851441 + 489913956 = 40729^2 + 22134^2 .

It is a cyclic number.

It is not a de Polignac number, because 2148765397 - 2³ = 2148765389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2148765497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074382698 + 1074382699.

It is an arithmetic number, because the mean of its divisors is an integer number (1074382699).

Almost surely, 2^2148765397 is an apocalyptic number.

It is an amenable number.

2148765397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2148765397 is an equidigital number, since it uses as much as digits as its factorization.

2148765397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 2148765397 is about 46354.7774991963. Note that the first 3 decimals coincide. The cubic root of 2148765397 is about 1290.4157858884.

The spelling of 2148765397 in words is "two billion, one hundred forty-eight million, seven hundred sixty-five thousand, three hundred ninety-seven".