55906397 has 2 divisors, whose sum is σ = 55906398. Its totient is φ = 55906396.

The previous prime is 55906373. The next prime is 55906441. The reversal of 55906397 is 79360955.

It is an a-pointer prime, because the next prime (55906441) can be obtained adding 55906397 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42758521 + 13147876 = 6539^2 + 3626^2 .

It is a cyclic number.

It is not a de Polignac number, because 55906397 - 2¹⁰ = 55905373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55906327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27953198 + 27953199.

It is an arithmetic number, because the mean of its divisors is an integer number (27953199).

Almost surely, 2^55906397 is an apocalyptic number.

It is an amenable number.

55906397 is a deficient number, since it is larger than the sum of its proper divisors (1).

55906397 is an equidigital number, since it uses as much as digits as its factorization.

55906397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 255150, while the sum is 44.

The square root of 55906397 is about 7477.0580444450. The cubic root of 55906397 is about 382.3729556577.

The spelling of 55906397 in words is "fifty-five million, nine hundred six thousand, three hundred ninety-seven".