2154281369 has 2 divisors, whose sum is σ = 2154281370. Its totient is φ = 2154281368.

The previous prime is 2154281329. The next prime is 2154281383. The reversal of 2154281369 is 9631824512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1919578969 + 234702400 = 43813^2 + 15320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154281369 - 2⁸ = 2154281113 is a prime.

It is a super-2 number, since 2×2154281369² = 9281856433641028322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2154281329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077140684 + 1077140685.

It is an arithmetic number, because the mean of its divisors is an integer number (1077140685).

Almost surely, 2^2154281369 is an apocalyptic number.

It is an amenable number.

2154281369 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154281369 is an equidigital number, since it uses as much as digits as its factorization.

2154281369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 2154281369 is about 46414.2367059936. The cubic root of 2154281369 is about 1291.5190264401.

The spelling of 2154281369 in words is "two billion, one hundred fifty-four million, two hundred eighty-one thousand, three hundred sixty-nine".