55397971 has 2 divisors, whose sum is σ = 55397972. Its totient is φ = 55397970.

The previous prime is 55397957. The next prime is 55397981. The reversal of 55397971 is 17979355.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55397971 - 2¹³ = 55389779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55397981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27698985 + 27698986.

It is an arithmetic number, because the mean of its divisors is an integer number (27698986).

Almost surely, 2^55397971 is an apocalyptic number.

55397971 is a deficient number, since it is larger than the sum of its proper divisors (1).

55397971 is an equidigital number, since it uses as much as digits as its factorization.

55397971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 297675, while the sum is 46.

The square root of 55397971 is about 7442.9813247112. The cubic root of 55397971 is about 381.2102939568.

The spelling of 55397971 in words is "fifty-five million, three hundred ninety-seven thousand, nine hundred seventy-one".