2142155317 has 2 divisors, whose sum is σ = 2142155318. Its totient is φ = 2142155316.

The previous prime is 2142155221. The next prime is 2142155357. The reversal of 2142155317 is 7135512412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1669049316 + 473106001 = 40854^2 + 21751^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142155317 - 2¹¹ = 2142153269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2142155357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071077658 + 1071077659.

It is an arithmetic number, because the mean of its divisors is an integer number (1071077659).

Almost surely, 2^2142155317 is an apocalyptic number.

It is an amenable number.

2142155317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142155317 is an equidigital number, since it uses as much as digits as its factorization.

2142155317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 2142155317 is about 46283.4237821707. The cubic root of 2142155317 is about 1289.0912248111.

Adding to 2142155317 its reverse (7135512412), we get a palindrome (9277667729).

The spelling of 2142155317 in words is "two billion, one hundred forty-two million, one hundred fifty-five thousand, three hundred seventeen".