2151395994169 has 2 divisors, whose sum is σ = 2151395994170. Its totient is φ = 2151395994168.

The previous prime is 2151395994161. The next prime is 2151395994179. The reversal of 2151395994169 is 9614995931512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1378733898025 + 772662096144 = 1174195^2 + 879012^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151395994169 - 2³ = 2151395994161 is a prime.

It is a super-2 number, since 2×2151395994169² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151395994169.

It is not a weakly prime, because it can be changed into another prime (2151395994161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075697997084 + 1075697997085.

It is an arithmetic number, because the mean of its divisors is an integer number (1075697997085).

Almost surely, 2^{2151395994169} is an apocalyptic number.

It is an amenable number.

2151395994169 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151395994169 is an equidigital number, since it uses as much as digits as its factorization.

2151395994169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23619600, while the sum is 64.

The spelling of 2151395994169 in words is "two trillion, one hundred fifty-one billion, three hundred ninety-five million, nine hundred ninety-four thousand, one hundred sixty-nine".