55391471 has 2 divisors, whose sum is σ = 55391472. Its totient is φ = 55391470.

The previous prime is 55391459. The next prime is 55391489. The reversal of 55391471 is 17419355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55391471 - 2⁶ = 55391407 is a prime.

It is a super-3 number, since 3×55391471³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55391411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27695735 + 27695736.

It is an arithmetic number, because the mean of its divisors is an integer number (27695736).

Almost surely, 2^55391471 is an apocalyptic number.

55391471 is a deficient number, since it is larger than the sum of its proper divisors (1).

55391471 is an equidigital number, since it uses as much as digits as its factorization.

55391471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 55391471 is about 7442.5446589187. The cubic root of 55391471 is about 381.1953838811.

The spelling of 55391471 in words is "fifty-five million, three hundred ninety-one thousand, four hundred seventy-one".