2148178061 has 2 divisors, whose sum is σ = 2148178062. Its totient is φ = 2148178060.

The previous prime is 2148178049. The next prime is 2148178063. The reversal of 2148178061 is 1608718412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1877575561 + 270602500 = 43331^2 + 16450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2148178061 - 2¹⁴ = 2148161677 is a prime.

It is a super-2 number, since 2×2148178061² = 9229337963523439442, which contains 22 as substring.

Together with 2148178063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2148178063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074089030 + 1074089031.

It is an arithmetic number, because the mean of its divisors is an integer number (1074089031).

Almost surely, 2^2148178061 is an apocalyptic number.

It is an amenable number.

2148178061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2148178061 is an equidigital number, since it uses as much as digits as its factorization.

2148178061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 2148178061 is about 46348.4418400446. The cubic root of 2148178061 is about 1290.2982025989.

The spelling of 2148178061 in words is "two billion, one hundred forty-eight million, one hundred seventy-eight thousand, sixty-one".