54821951 has 4 divisors (see below), whose sum is σ = 54956400. Its totient is φ = 54687504.

The previous prime is 54821941. The next prime is 54821969. The reversal of 54821951 is 15912845.

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

It is a cyclic number.

It is not a de Polignac number, because 54821951 - 2⁶ = 54821887 is a prime.

It is a super-2 number, since 2×54821951² = 6010892622892802, 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 (54821941) 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, 66611 + ... + 67428.

It is an arithmetic number, because the mean of its divisors is an integer number (13739100).

Almost surely, 2^54821951 is an apocalyptic number.

54821951 is a deficient number, since it is larger than the sum of its proper divisors (134449).

54821951 is a wasteful number, since it uses less digits than its factorization.

54821951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134448.

The product of its digits is 14400, while the sum is 35.

The square root of 54821951 is about 7404.1846951572. The cubic root of 54821951 is about 379.8844316151.

The spelling of 54821951 in words is "fifty-four million, eight hundred twenty-one thousand, nine hundred fifty-one".