2154429997 has 4 divisors (see below), whose sum is σ = 2156876316. Its totient is φ = 2151983680.

The previous prime is 2154429961. The next prime is 2154430001. The reversal of 2154429997 is 7999244512.

2154429997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1174364361 + 980065636 = 34269^2 + 31306^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154429997 - 2¹⁹ = 2153905709 is a prime.

It is a super-2 number, since 2×2154429997² = 9283137223946840018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154429197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221838 + ... + 1223599.

It is an arithmetic number, because the mean of its divisors is an integer number (539219079).

Almost surely, 2^2154429997 is an apocalyptic number.

It is an amenable number.

2154429997 is a deficient number, since it is larger than the sum of its proper divisors (2446319).

2154429997 is an equidigital number, since it uses as much as digits as its factorization.

2154429997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446318.

The product of its digits is 1632960, while the sum is 52.

The square root of 2154429997 is about 46415.8377819468. The cubic root of 2154429997 is about 1291.5487272146.

The spelling of 2154429997 in words is "two billion, one hundred fifty-four million, four hundred twenty-nine thousand, nine hundred ninety-seven".