2154597977 has 4 divisors (see below), whose sum is σ = 2462397696. Its totient is φ = 1846798260.

The previous prime is 2154597971. The next prime is 2154597989. The reversal of 2154597977 is 7797954512.

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 2154597977 - 2⁸ = 2154597721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154597971) 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 3 ways as a sum of consecutive naturals, for example, 153899849 + ... + 153899862.

It is an arithmetic number, because the mean of its divisors is an integer number (615599424).

Almost surely, 2^2154597977 is an apocalyptic number.

It is an amenable number.

2154597977 is a deficient number, since it is larger than the sum of its proper divisors (307799719).

2154597977 is an equidigital number, since it uses as much as digits as its factorization.

2154597977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307799718.

The product of its digits is 5556600, while the sum is 56.

The square root of 2154597977 is about 46417.6472583435. The cubic root of 2154597977 is about 1291.5822935125.

The spelling of 2154597977 in words is "two billion, one hundred fifty-four million, five hundred ninety-seven thousand, nine hundred seventy-seven".