2148878957 has 2 divisors, whose sum is σ = 2148878958. Its totient is φ = 2148878956.

The previous prime is 2148878911. The next prime is 2148879001. The reversal of 2148878957 is 7598788412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2058799876 + 90079081 = 45374^2 + 9491^2 .

It is a cyclic number.

It is not a de Polignac number, because 2148878957 - 2¹⁶ = 2148813421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2148878896 and 2148878905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2148878657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074439478 + 1074439479.

It is an arithmetic number, because the mean of its divisors is an integer number (1074439479).

Almost surely, 2^2148878957 is an apocalyptic number.

It is an amenable number.

2148878957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2148878957 is an equidigital number, since it uses as much as digits as its factorization.

2148878957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 59.

The square root of 2148878957 is about 46356.0023837259. The cubic root of 2148878957 is about 1290.4385178621.

The spelling of 2148878957 in words is "two billion, one hundred forty-eight million, eight hundred seventy-eight thousand, nine hundred fifty-seven".