54779921 has 4 divisors (see below), whose sum is σ = 62605632. Its totient is φ = 46954212.

The previous prime is 54779911. The next prime is 54779939. The reversal of 54779921 is 12997745.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12997745 = 5 ⋅2599549.

It is a cyclic number.

It is not a de Polignac number, because 54779921 - 2¹⁴ = 54763537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54779911) 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, 3912845 + ... + 3912858.

It is an arithmetic number, because the mean of its divisors is an integer number (15651408).

Almost surely, 2^54779921 is an apocalyptic number.

It is an amenable number.

54779921 is a deficient number, since it is larger than the sum of its proper divisors (7825711).

54779921 is an equidigital number, since it uses as much as digits as its factorization.

54779921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7825710.

The product of its digits is 158760, while the sum is 44.

The square root of 54779921 is about 7401.3458911201. The cubic root of 54779921 is about 379.7873255932.

The spelling of 54779921 in words is "fifty-four million, seven hundred seventy-nine thousand, nine hundred twenty-one".