54020991 has 4 divisors (see below), whose sum is σ = 72027992. Its totient is φ = 36013992.

The previous prime is 54020977. The next prime is 54021007. The reversal of 54020991 is 19902045.

It is a happy number.

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

It is not a de Polignac number, because 54020991 - 2⁹ = 54020479 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 (54021991) 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, 9003496 + ... + 9003501.

It is an arithmetic number, because the mean of its divisors is an integer number (18006998).

Almost surely, 2^54020991 is an apocalyptic number.

54020991 is a deficient number, since it is larger than the sum of its proper divisors (18007001).

54020991 is a wasteful number, since it uses less digits than its factorization.

54020991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18007000.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 54020991 is about 7349.8973462219. The cubic root of 54020991 is about 378.0252845549.

The spelling of 54020991 in words is "fifty-four million, twenty thousand, nine hundred ninety-one".