2154099997 has 4 divisors (see below), whose sum is σ = 2461828576. Its totient is φ = 1846371420.

The previous prime is 2154099949. The next prime is 2154100021. The reversal of 2154099997 is 7999904512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2154099997 - 2¹⁹ = 2153575709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154099907) 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, 153864279 + ... + 153864292.

It is an arithmetic number, because the mean of its divisors is an integer number (615457144).

Almost surely, 2^2154099997 is an apocalyptic number.

It is an amenable number.

2154099997 is a deficient number, since it is larger than the sum of its proper divisors (307728579).

2154099997 is an equidigital number, since it uses as much as digits as its factorization.

2154099997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307728578.

The product of its (nonzero) digits is 1837080, while the sum is 55.

The square root of 2154099997 is about 46412.2828247006. The cubic root of 2154099997 is about 1291.4827804841.

The spelling of 2154099997 in words is "two billion, one hundred fifty-four million, ninety-nine thousand, nine hundred ninety-seven".