54997391 has 2 divisors, whose sum is σ = 54997392.
Its totient is φ = 54997390.
The previous prime is 54997373. The next prime is 54997399. The reversal of 54997391 is 19379945.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 54997391 - 210 = 54996367 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (54997399) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27498695 + 27498696.
It is an arithmetic number, because the mean of its divisors is an integer number (27498696).
Almost surely, 254997391 is an apocalyptic number.
54997391 is a deficient number, since it is larger than the sum of its proper divisors (1).
54997391 is an equidigital number, since it uses as much as digits as its factorization.
54997391 is an evil number, because the sum of its binary digits is even.
The product of its digits is 306180, while the sum is 47.
The square root of 54997391 is about 7416.0225862655.
The cubic root of 54997391 is about 380.2892327065.
The spelling of 54997391 in words is "fifty-four million, nine hundred ninety-seven thousand, three hundred ninety-one".