2154122077 has 2 divisors, whose sum is σ = 2154122078. Its totient is φ = 2154122076.

The previous prime is 2154122011. The next prime is 2154122081. The reversal of 2154122077 is 7702214512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2013675876 + 140446201 = 44874^2 + 11851^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154122077 - 2²⁷ = 2019904349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154122177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077061038 + 1077061039.

It is an arithmetic number, because the mean of its divisors is an integer number (1077061039).

Almost surely, 2^2154122077 is an apocalyptic number.

It is an amenable number.

2154122077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154122077 is an equidigital number, since it uses as much as digits as its factorization.

2154122077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 2154122077 is about 46412.5206921581. The cubic root of 2154122077 is about 1291.4871931302.

Adding to 2154122077 its reverse (7702214512), we get a palindrome (9856336589).

The spelling of 2154122077 in words is "two billion, one hundred fifty-four million, one hundred twenty-two thousand, seventy-seven".