55378957 has 2 divisors, whose sum is σ = 55378958. Its totient is φ = 55378956.

The previous prime is 55378931. The next prime is 55379021. The reversal of 55378957 is 75987355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34821801 + 20557156 = 5901^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 55378957 - 2¹⁹ = 54854669 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55378957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55378157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27689478 + 27689479.

It is an arithmetic number, because the mean of its divisors is an integer number (27689479).

Almost surely, 2^55378957 is an apocalyptic number.

It is an amenable number.

55378957 is a deficient number, since it is larger than the sum of its proper divisors (1).

55378957 is an equidigital number, since it uses as much as digits as its factorization.

55378957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 49.

The square root of 55378957 is about 7441.7039043488. The cubic root of 55378957 is about 381.1666752596.

The spelling of 55378957 in words is "fifty-five million, three hundred seventy-eight thousand, nine hundred fifty-seven".