54601991 has 4 divisors (see below), whose sum is σ = 57475800. Its totient is φ = 51728184.

The previous prime is 54601969. The next prime is 54602003. The reversal of 54601991 is 19910645.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19910645 = 5 ⋅3982129.

It is not a de Polignac number, because 54601991 - 2¹⁰ = 54600967 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 (54601951) 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, 1436876 + ... + 1436913.

It is an arithmetic number, because the mean of its divisors is an integer number (14368950).

Almost surely, 2^54601991 is an apocalyptic number.

54601991 is a deficient number, since it is larger than the sum of its proper divisors (2873809).

54601991 is a wasteful number, since it uses less digits than its factorization.

54601991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873808.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 54601991 is about 7389.3160035283. The cubic root of 54601991 is about 379.3756853808.

The spelling of 54601991 in words is "fifty-four million, six hundred one thousand, nine hundred ninety-one".