2154628969 has 8 divisors (see below), whose sum is σ = 2179217160. Its totient is φ = 2130137856.

The previous prime is 2154628963. The next prime is 2154628997. The reversal of 2154628969 is 9698264512.

It can be written as a sum of positive squares in 4 ways, for example, as 46717225 + 2107911744 = 6835^2 + 45912^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2154628969 - 2³ = 2154628961 is a prime.

It is a super-2 number, since 2×2154628969² = 9284851988108005922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154628961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20847 + ... + 68875.

It is an arithmetic number, because the mean of its divisors is an integer number (272402145).

Almost surely, 2^2154628969 is an apocalyptic number.

It is an amenable number.

2154628969 is a deficient number, since it is larger than the sum of its proper divisors (24588191).

2154628969 is a wasteful number, since it uses less digits than its factorization.

2154628969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48539.

The product of its digits is 1866240, while the sum is 52.

The square root of 2154628969 is about 46417.9810956918. The cubic root of 2154628969 is about 1291.5884862418.

The spelling of 2154628969 in words is "two billion, one hundred fifty-four million, six hundred twenty-eight thousand, nine hundred sixty-nine".