54399961 has 16 divisors (see below), whose sum is σ = 68112000. Its totient is φ = 42209280.

The previous prime is 54399959. The next prime is 54399971. The reversal of 54399961 is 16999345.

It is a cyclic number.

It is not a de Polignac number, because 54399961 - 2¹ = 54399959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54399941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18415 + ... + 21163.

It is an arithmetic number, because the mean of its divisors is an integer number (4257000).

Almost surely, 2^54399961 is an apocalyptic number.

It is an amenable number.

54399961 is a deficient number, since it is larger than the sum of its proper divisors (13712039).

54399961 is a wasteful number, since it uses less digits than its factorization.

54399961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024.

The product of its digits is 262440, while the sum is 46.

The square root of 54399961 is about 7375.6329219939. The cubic root of 54399961 is about 378.9072043266.

It can be divided in two parts, 5439 and 9961, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 54399961 in words is "fifty-four million, three hundred ninety-nine thousand, nine hundred sixty-one".